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53 lines
1.6 KiB
Markdown
53 lines
1.6 KiB
Markdown
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# Print argument list for testing
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\-\-\-- dataentry snipplet \-\-\-- snipplet_tags: debug, arguments
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LastUpdate_dt: 2013-03-23 Contributors: Snappy (IRC), Dan Douglas type:
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snipplet
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------------------------------------------------------------------------
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Sometimes you might find it useful to see how arguments passed to a
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program arrive there.
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Check this script (save it as script file or make a function):
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printf '"%b"\n' "$0" "$@" | nl -v0 -s": "
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It uses the [printf command](/commands/builtin/printf) to generate a
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list of arguments, even with escape sequences interpreted. This list is
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shown formatted by the nl(1) utility.
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Another alternative with colorized output. If run in Bash, it
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temporarily disables all debug output for itself, including the test
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that determines whether to hide debug output. In ksh, tracing would have
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to be enabled on the function to show debug output, so it works out to
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being equivalent.
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``` bash
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# Bash or ksh93 debugging function for colored display of argv.
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# Optionally set OFD to the desired output file descriptor.
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function args {
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{ BASH_XTRACEFD=3 command eval ${BASH_VERSION+"$(</dev/fd/0)"}; } <<-'EOF' 3>/dev/null
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case $- in *x*)
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set +x
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trap 'trap RETURN; set -x' RETURN
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esac
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EOF
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[[ ${OFD-1} == +([0-9]) ]] || return
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if [[ -t ${OFD:-2} ]]; then
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typeset -A clr=([green]=$(tput setaf 2) [sgr0]=$(tput sgr0))
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else
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typeset clr
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fi
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if ! ${1+false}; then
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printf -- "${clr[green]}<${clr[sgr0]}%s${clr[green]}>${clr[sgr0]} " "$@"
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echo
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else
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echo 'no args.'
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fi >&"${OFD:-2}"
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}
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```
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