mirror of https://github.com/tLDP/LDP
49 lines
1011 B
Bash
49 lines
1011 B
Bash
#!/bin/bash
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echo
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if test -z "$1"
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then
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echo "No command-line arguments."
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else
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echo "First command-line argument is $1."
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fi
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echo
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if /usr/bin/test -z "$1" # Equivalent to "test" builtin.
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# ^^^^^^^^^^^^^ # Specifying full pathname.
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then
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echo "No command-line arguments."
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else
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echo "First command-line argument is $1."
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fi
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echo
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if [ -z "$1" ] # Functionally identical to above code blocks.
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# if [ -z "$1" should work, but...
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#+ Bash responds to a missing close-bracket with an error message.
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then
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echo "No command-line arguments."
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else
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echo "First command-line argument is $1."
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fi
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echo
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if /usr/bin/[ -z "$1" ] # Again, functionally identical to above.
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# if /usr/bin/[ -z "$1" # Works, but gives an error message.
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# # Note:
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# This has been fixed in Bash, version 3.x.
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then
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echo "No command-line arguments."
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else
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echo "First command-line argument is $1."
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fi
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echo
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exit 0
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