51 lines
1.1 KiB
Plaintext
51 lines
1.1 KiB
Plaintext
#
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# whatis -- and implementation of the 10th Edition Unix sh builtin `whatis'
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# command.
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#
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# usage: whatis arg [...]
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#
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# For each argument, whatis prints the associated value as a parameter,
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# builtin, function, alias, or executable file as appropriate. In each
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# case, the value is printed in a form which would yield the same value
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# if typed as input to the shell itself.
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#
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whatis ()
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{
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local fail=0
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if [ $# -eq 0 ] ; then
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echo 'usage: whatis arg [arg...]'
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return 1
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fi
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for arg; do
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case $(builtin type -type $arg 2>/dev/null) in
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"alias")
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builtin alias "$arg"
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;;
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"function")
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builtin type "$arg" | sed 1d
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;;
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"builtin")
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echo builtin "$arg"
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;;
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"file")
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builtin type -path "$arg"
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;;
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*)
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# OK, we could have a variable, or we could have nada.
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if [ "$(eval echo \${$arg+set})" = "set" ] ; then
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# It is a variable, and it is set.
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echo -n "$arg="
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eval echo '\"'\$$arg'\"'
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else
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echo whatis: $arg: not found
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fail=1
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fi
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;;
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esac
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done
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return $fail
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}
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