mirror of
https://github.com/notwa/rc
synced 2024-11-12 15:59:02 -08:00
37 lines
1.2 KiB
Bash
Executable file
37 lines
1.2 KiB
Bash
Executable file
#!/usr/bin/env sh
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# compat: +ash +bash +dash +zsh YES_BB_AWK
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sv() { ### @-
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### collect the lastmost value of every key.
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### the field separator can be given as its sole argument,
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### it defaults to a single space otherwise.
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###
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### ```
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### $ echo "alpha=first\nbeta=second\nalpha=third" | sv =
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### alpha=third
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### beta=second
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### ```
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###
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### this next example uses `sv` to only print the lastmost line
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### matching a pattern in each file. in other words, it uses
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### the filename printed by grep as the key in its key-value pairs.
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###
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### ```
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### $ cd ~/play/hash && grep -r 'ing$' . | sv :
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### ./dic_win32.txt:WriteProfileString
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### ./cracklib-small.txt:zoning
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### ./english-words.txt:zooming
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### ./usernames-125k.txt:flats_gaming
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### ./cain.txt:zoografting
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### ./pokemon.txt:Fletchling
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### ./pokemon8.txt:Fletchling
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### ```
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###
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### **TODO:** rename because busybox(1) sv already exists.
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[ $# -le 1 ] || { printf "%s\n" "$0: too many arguments" >&2; return 1; }
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awk "-F${1:- }" '
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NF>1{f[$1]=substr($0,length($1)+1+length(FS))}END{for(k in f)print k FS f[k]}
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'
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}
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[ -n "${preload+-}" ] || sv "$@"
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