mirror of https://github.com/tLDP/LDP
70 lines
1.8 KiB
Bash
70 lines
1.8 KiB
Bash
#! /bin/sh
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# letter-count2.sh: Counting letter occurrences in a text file.
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#
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# Script by nyal [nyal@voila.fr].
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# Used in ABS Guide with permission.
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# Recommented and reformatted by ABS Guide author.
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# Version 1.1: Modified to work with gawk 3.1.3.
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# (Will still work with earlier versions.)
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INIT_TAB_AWK=""
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# Parameter to initialize awk script.
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count_case=0
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FILE_PARSE=$1
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E_PARAMERR=85
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usage()
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{
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echo "Usage: letter-count.sh file letters" 2>&1
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# For example: ./letter-count2.sh filename.txt a b c
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exit $E_PARAMERR # Too few arguments passed to script.
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}
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if [ ! -f "$1" ] ; then
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echo "$1: No such file." 2>&1
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usage # Print usage message and exit.
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fi
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if [ -z "$2" ] ; then
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echo "$2: No letters specified." 2>&1
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usage
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fi
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shift # Letters specified.
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for letter in `echo $@` # For each one . . .
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do
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INIT_TAB_AWK="$INIT_TAB_AWK tab_search[${count_case}] = \
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\"$letter\"; final_tab[${count_case}] = 0; "
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# Pass as parameter to awk script below.
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count_case=`expr $count_case + 1`
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done
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# DEBUG:
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# echo $INIT_TAB_AWK;
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cat $FILE_PARSE |
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# Pipe the target file to the following awk script.
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# ---------------------------------------------------------------------
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# Earlier version of script:
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# awk -v tab_search=0 -v final_tab=0 -v tab=0 -v \
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# nb_letter=0 -v chara=0 -v chara2=0 \
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awk \
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"BEGIN { $INIT_TAB_AWK } \
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{ split(\$0, tab, \"\"); \
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for (chara in tab) \
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{ for (chara2 in tab_search) \
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{ if (tab_search[chara2] == tab[chara]) { final_tab[chara2]++ } } } } \
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END { for (chara in final_tab) \
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{ print tab_search[chara] \" => \" final_tab[chara] } }"
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# ---------------------------------------------------------------------
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# Nothing all that complicated, just . . .
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#+ for-loops, if-tests, and a couple of specialized functions.
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exit $?
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# Compare this script to letter-count.sh.
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