Created
October 19, 2023 00:49
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Testing out argument handling
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| #!/bin/bash | |
| set -u | |
| suffixes=( "-" ":-" "+" ":+" "+x" ":+x" ) | |
| function header { | |
| printf "%10s | " "\$#" | |
| printf "%10s | " "\$*" | |
| for predicate in "-n" "-z"; do | |
| for suffix in "${suffixes[@]}"; do | |
| header=$(printf '%s ${1%s%s}' $predicate $suffix) | |
| printf "%10s | " "$header" | |
| done | |
| done | |
| echo | |
| } | |
| function test { | |
| printf "%10s | " "\`$#\`" | |
| printf "%10s | " "\`$*\`" | |
| for predicate in "-n" "-z"; do | |
| for suffix in "${suffixes[@]}"; do | |
| str="if [[ $predicate "\${1${suffix}}" ]]; then printf '%10s | ' 'T'; else printf '%10s | ' 'F'; fi" | |
| eval $str | |
| done | |
| done | |
| echo | |
| } | |
| header | |
| test | |
| test "" | |
| test "arg" |
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| ./args_table.sh | |
| $# | $* | -n ${1-} | -n ${1:-} | -n ${1+} | -n ${1:+} | -n ${1+x} | -n ${1:+x} | -z ${1-} | -z ${1:-} | -z ${1+} | -z ${1:+} | -z ${1+x} | -z ${1:+x} | | |
| `0` | `` | F | F | F | F | F | F | T | T | T | T | T | T | | |
| `1` | `` | F | F | F | F | T | F | T | T | T | T | F | T | | |
| `1` | `arg` | T | T | F | F | T | T | F | F | T | T | F | F | |
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