52 lines
1.0 KiB
Bash
Executable File
52 lines
1.0 KiB
Bash
Executable File
#!/bin/sh
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_printhelp ()
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{
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cat<<EOF
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Usage: ${1##*/} [OPTIONS] [FILES]
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Cut last 10 lines from stdin. If FILES are provided, cut files instead of stdin
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and output to stdout.
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Note: GNU 'head' has the '-n -10' option to do this. This program is only useful
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for non-GNU systems.
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Synopsis:
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-h: Show this help.
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-t: Cut head instead of the tail. Like 'tail -n +11' with GNU tail (11
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because the limit line is included).
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-n N: Cut N lines instead of 10.
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EOF
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}
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OPT_TAIL=true
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OPT_LINES=10
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while getopts ":hn:t" opt; do
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case $opt in
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h)
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_printhelp "$0"
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exit 1 ;;
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n)
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OPT_LINES=$OPTARG ;;
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t)
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OPT_TAIL=false ;;
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?)
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_printhelp "$0"
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exit 1 ;;
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:)
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_printhelp "$0"
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exit 1 ;;
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esac
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done
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shift $(($OPTIND - 1))
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if $OPT_TAIL; then
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# sed -n -e ":begin ; 1,${OPT_LINES}!{P;N;D} ; N ; b begin" $1
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sed -n -e ":begin ; 1,${OPT_LINES}!{P;N;D} ; N ; b begin" $1
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else
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sed -n -e "1,${OPT_LINES}!p" "$@"
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fi
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