mirror of
https://github.com/notwa/rc
synced 2024-11-05 03:39:02 -08:00
43 lines
1.2 KiB
Bash
Executable file
43 lines
1.2 KiB
Bash
Executable file
#!/usr/bin/env dash
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# YES_ZSH
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# YES_BASH
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# YES_DASH
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minutemaid() { ### @-
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### return 0 and/or execute a command if the current minute
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### is divisible by a given number. note that a minute is
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### relative to the seconds since the epoch, not the minute of the hour.
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### this ensures that commands will run roughly every N minutes,
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### regardless of the minute hand on the clock.
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###
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### ```
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### # crontab usage:
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### * * * * * minutemaid 9 ~/work/do_my_bidding # runs every nine minutes
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### ```
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local offset=0 name
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while getopts 'o:h' name; do
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case $name in
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o) offset="$OPTARG";;
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?) local fd=0
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[ $name = h ] && fd=1 || fd=2
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printf "%s\n" "usage: $0 [-o offset] {interval} [{command} [{args...}]]" >&$fd
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[ $name = h ] && return 0 || return 1;;
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esac
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done
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shift $((OPTIND-1))
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local interval="${1:?no interval specified}"
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shift
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local sec="$(date +%s)"
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local min="$((sec/60+offset))"
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local mod="$((min%interval))"
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if [ $# -gt 0 ]; then
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[ $mod -ne 0 ] || "$@"
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else
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[ $mod -eq 0 ] && return 0 || return 1
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fi
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}
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[ -n "${preload+-}" ] || minutemaid "$@"
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