500 lines
6.5 KiB
HTML
500 lines
6.5 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>Mathematical tools</TITLE
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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TITLE="GNU/Linux Command-Line Tools Summary"
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><TR
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><TH
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COLSPAN="3"
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>GNU/Linux Command-Line Tools Summary</TH
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><TD
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WIDTH="10%"
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ALIGN="left"
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><A
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ACCESSKEY="P"
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>Prev</A
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ACCESSKEY="N"
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="CHAPTER"
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><H1
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><A
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NAME="MATHEMATICAL-TOOLS"
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></A
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>Chapter 12. Mathematical tools</H1
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><P
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></P
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><DIV
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CLASS="NOTE"
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><BLOCKQUOTE
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CLASS="NOTE"
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><P
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><B
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>num-utils homepage: </B
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>The “num-utils” homepage, <A
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HREF="http://suso.suso.org/programs/num-utils/"
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TARGET="_top"
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>Num Utils,</A
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> contains a variety of command line programs that could be useful when performing maths on your GNU/Linux machine.</P
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></BLOCKQUOTE
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></DIV
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><P
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></P
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><DIV
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CLASS="VARIABLELIST"
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><DL
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><DT
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>units</DT
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><DD
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><P
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><A
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NAME="AEN8125"
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></A
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>Convert <A
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NAME="AEN8127"
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></A
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>units of measurement <A
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NAME="AEN8129"
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></A
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>between different scales.<A
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NAME="AEN8131"
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></A
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> For example, centimeters <A
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NAME="AEN8133"
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></A
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>to inches,<A
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NAME="AEN8135"
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></A
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> litres <A
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NAME="AEN8137"
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></A
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>to gallons.<A
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NAME="AEN8139"
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></A
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></P
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><P
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>Simply run <A
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NAME="AEN8142"
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></A
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>the program,<A
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NAME="AEN8144"
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></A
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> I recommend <A
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NAME="AEN8146"
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></A
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>running <A
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NAME="AEN8148"
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></A
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>it as follows:<A
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NAME="AEN8150"
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></A
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></P
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><PRE
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CLASS="SCREEN"
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>units --verbose<A
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NAME="AEN8153"
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></A
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></PRE
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><P
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>This will run the program and it will tell <A
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NAME="AEN8156"
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></A
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>you exactly <A
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NAME="AEN8158"
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></A
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>what it is doing.</P
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><P
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>Example: you enter <A
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NAME="AEN8161"
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></A
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>“60 meters<A
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NAME="AEN8163"
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></A
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>” then you want it worked out in “kilometers”. The first line will tell <A
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NAME="AEN8165"
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></A
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>you what this evaluates <A
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NAME="AEN8167"
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></A
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>to.</P
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><P
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>If you wanted the conversion <A
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NAME="AEN8170"
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></A
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>rate for “meters” to “kilometers” read the second line of the output <A
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NAME="AEN8172"
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></A
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>(which will tell <A
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NAME="AEN8174"
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></A
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>you meters/1000).</P
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><DIV
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CLASS="NOTE"
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><BLOCKQUOTE
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CLASS="NOTE"
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><P
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><B
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>To exit: </B
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>Press <A
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NAME="AEN8179"
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></A
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>
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<B
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CLASS="KEYCAP"
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>CTRL</B
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>-<B
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CLASS="KEYCAP"
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>D</B
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>
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<A
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NAME="AEN8184"
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></A
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>
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(end-of-file key) when you are finished <A
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NAME="AEN8186"
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></A
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>using <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>units</I
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></SPAN
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>.</P
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></BLOCKQUOTE
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></DIV
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></DD
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><DT
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>python</DT
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><DD
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><P
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><A
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NAME="AEN8193"
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></A
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>Python <A
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NAME="AEN8195"
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></A
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>is a very powerful,<A
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NAME="AEN8197"
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></A
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> easy to learn,<A
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NAME="AEN8199"
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></A
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> general <A
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NAME="AEN8201"
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></A
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>purpose, interpreted<A
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NAME="AEN8203"
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></A
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> programming <A
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NAME="AEN8205"
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></A
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>language. And it makes a great <A
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NAME="AEN8207"
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></A
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>calculator! If you don't have a calculator <A
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NAME="AEN8209"
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></A
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>installed<A
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NAME="AEN8211"
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></A
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> then simply type <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>python</I
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></SPAN
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>, then hit <A
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NAME="AEN8214"
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></A
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>[Enter]. </P
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><P
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>This will execute <A
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NAME="AEN8217"
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></A
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>the <SPAN
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CLASS="ACRONYM"
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>Python</SPAN
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> <A
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NAME="AEN8220"
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></A
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>interpreter in interactive <A
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NAME="AEN8222"
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></A
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>mode. Type your sums <A
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NAME="AEN8224"
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></A
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>just like you would use a calculator.<A
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NAME="AEN8226"
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></A
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> Note that if you want to work out fractions <A
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NAME="AEN8228"
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></A
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>make sure you use a decimal<A
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NAME="AEN8230"
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></A
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> point and a zero <A
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NAME="AEN8232"
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></A
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>to obtain the correct <A
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NAME="AEN8234"
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></A
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>answer (otherwise it will use integer<A
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NAME="AEN8236"
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></A
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> division).</P
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><P
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>To start <A
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NAME="AEN8239"
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></A
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>python in interactive <A
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NAME="AEN8241"
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></A
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>mode, simply type:</P
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><PRE
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CLASS="SCREEN"
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>python</PRE
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><P
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>Once python <A
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NAME="AEN8245"
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></A
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>is started <A
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NAME="AEN8247"
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></A
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>you can use it to add <A
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NAME="AEN8249"
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></A
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>up sums <A
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NAME="AEN8251"
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></A
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>or maybe do some python programming.<A
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NAME="AEN8253"
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></A
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></P
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><P
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>Use
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<B
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CLASS="KEYCAP"
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>CTRL</B
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>-<B
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CLASS="KEYCAP"
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>D</B
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>
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<A
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NAME="AEN8259"
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></A
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>
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(end-of-file key) to exit <A
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NAME="AEN8261"
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></A
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>the <SPAN
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CLASS="ACRONYM"
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>Python</SPAN
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> <A
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NAME="AEN8264"
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></A
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>interpreter.</P
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></DD
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><DT
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>numgrep</DT
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><DD
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><P
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><A
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NAME="AEN8270"
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></A
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>A little bit <A
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NAME="AEN8272"
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></A
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>like grep <A
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NAME="AEN8274"
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></A
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>only this is designed <A
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NAME="AEN8276"
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></A
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>for numbers <A
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NAME="AEN8278"
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></A
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>only. </P
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><P
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>Use '/' (forward slashes) to contain each expression.<A
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NAME="AEN8281"
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></A
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> </P
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><P
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>Use m<n> to find <A
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NAME="AEN8284"
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></A
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>multiples of the number <A
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NAME="AEN8286"
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></A
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>n and use f<n> to find factors<A
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NAME="AEN8288"
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></A
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> of the number n. </P
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><P
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>Use commas <A
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NAME="AEN8291"
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></A
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>to seperate expressions <A
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NAME="AEN8293"
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></A
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>and .. (two dots) to represent <A
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NAME="AEN8295"
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></A
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>a range.<A
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NAME="AEN8297"
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></A
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> </P
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><P
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>For example, to input <A
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NAME="AEN8300"
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></A
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>from standard <A
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NAME="AEN8302"
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></A
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>input <A
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NAME="AEN8304"
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></A
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><A
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NAME="AEN8306"
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></A
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>you could simply type:</P
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><PRE
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CLASS="SCREEN"
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>numgrep</PRE
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><P
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>To input from a file and look <A
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NAME="AEN8310"
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></A
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>for numbers <A
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NAME="AEN8312"
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></A
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>between 1 and 1000 you could type:</P
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><PRE
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CLASS="SCREEN"
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>numgrep /1..1000/ file_name</PRE
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><DIV
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CLASS="NOTE"
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><BLOCKQUOTE
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CLASS="NOTE"
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><P
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><B
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>This tool comes from the num-utils package: </B
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>Please note that this tool is part of the num-utils package.</P
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></BLOCKQUOTE
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></DIV
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></DD
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></DL
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></DIV
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><P
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></P
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></DIV
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ACCESSKEY="P"
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>Prev</A
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VALIGN="top"
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ACCESSKEY="H"
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>Home</A
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VALIGN="top"
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HREF="c8319.htm"
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ACCESSKEY="N"
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>Next</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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>Finding Text Within Files</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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> </TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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>Network Commands</TD
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