/usr/share/yash/completion/xargs is in yash 2.43-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Completion script for the "xargs" command.
# Supports POSIX 2008, GNU findutils 4.5.9, FreeBSD 8.1, OpenBSD 4.8,
# NetBSD 5.0, Darwin 10.6.4, SunOS 5.10, HP-UX 11i v3.
function completion/xargs {
case $("${WORDS[1]}" --version 2>/dev/null) in
(*'findutils'*) typeset type=GNU ;;
(*) typeset type="$(uname 2>/dev/null)" ;;
esac
case $type in
(GNU) typeset long=true ;;
(*) typeset long= ;;
esac
case $type in
(GNU|SunOS|HP-UX) typeset short=true ;;
(*) typeset short= ;;
esac
typeset OPTIONS ARGOPT PREFIX
OPTIONS=( #>#
"E: ${short:+e::} ${long:+--eof::}; specify a string to treat as end of input"
"I: ${short:+i::} ${long:+--replace::}; specify a string replaced by input words"
"L: ${short:+l::} ${long:+--max-lines::}; specify the max number of input lines to use at once"
"n: ${long:+--max-args:}; specify the max number of input words to use at once"
"p ${long:+--interactive}; confirm before each command invocation"
"s: ${long:+--max-chars:}; specify the max length of executed command lines in bytes"
"t ${long:+--verbose}; print each executed command line before execution"
"x ${long:+--exit}; abort when executed command line length exceeds the limit"
) #<#
case $type in (GNU|*BSD|Darwin)
OPTIONS=("$OPTIONS" #>#
"0 ${long:+--null}; assume input words are separated by null bytes"
"P: ${long:+--max-procs:}; specify the max number of commands executed at once"
) #<#
case $type in (GNU)
OPTIONS=("$OPTIONS" #>#
"a: --arg-file:; specify the file to read words from"
"d: --delimiter:; specify the delimiter that separates words"
"--help"
"--version"
) #<#
esac
case $type in (*BSD|Darwin)
OPTIONS=("$OPTIONS" #>#
"J:; like -I, but replace the first exact match only"
"o; reopen standard input as /dev/tty when executing commands"
"R:; specify the max number of operands replaced in -I"
) #<#
case $type in (FreeBSD|NetBSD)
OPTIONS=("$OPTIONS" #>#
"S:; specify how long the command line can grow in -I"
) #<#
esac
esac
case $type in (GNU|OpenBSD)
OPTIONS=("$OPTIONS" #>#
"r ${long:+--no-run-if-empty}; don't execute the command at all if input is empty"
) #<#
esac
esac
command -f completion//parseoptions
case $ARGOPT in
(-)
command -f completion//completeoptions
;;
([dEeIiJLlnPRSs]|--delimiter|--eof|--replace|--max-*)
;;
(a|--arg-file)
complete -P "$PREFIX" -f
;;
('')
command -f completion//getoperands
command -f completion//reexecute -e
;;
esac
}
# vim: set ft=sh ts=8 sts=8 sw=8 noet:
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