mirror of
https://github.com/notwa/rc
synced 2024-11-05 06:29:02 -08:00
52 lines
1.1 KiB
Bash
Executable file
52 lines
1.1 KiB
Bash
Executable file
#!/usr/bin/env sh
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# YES_ZSH YES_BASH YES_DASH YES_ASH
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now() { ### @-
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### print a date-time (UTC) in a sortable format.
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### this takes a date or file as an argument,
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### else it defaults to the current time.
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### ```
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### $ now
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### 2019-05-27_35083906
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### $ now ~/sh/monitor
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### 2017-03-14_82387259
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### $ now '@1234567890'
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### 2009-02-13_84690000
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### ```
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[ $# -le 1 ] || { printf "%s\n" "$0: too many arguments" >&2; return 1; }
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local dt= fmt='+%F_%T_%N'
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if [ -z "$1" ]; then
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dt="$(date -u "$fmt")"
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elif [ -e "$1" ]; then
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dt="$(date -u -r "$1" "$fmt")"
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else
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dt="$(date -u -d "$1" "$fmt")"
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fi
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local F= T= N=
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F=${dt%%_*}
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T=${dt#*_}
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T=${T%_*}
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N=${dt##*_}
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local H= M= S=
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H=${T%%:*}
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M=${T#*:}
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M=${M%:*}
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S=${T##*:}
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# don't interpret numbers as octal
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F=${F#0*}
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T=${T#0*}
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N=${N#0*}
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H=${H#0*}
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M=${M#0*}
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S=${S#0*}
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local ms=
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ms=$(( (H*60*60+M*60+S)*1000+N/1000000 ))
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ms=$(printf '%08i' $ms)
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echo "${F}_${ms}"
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}
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[ -n "${preload+-}" ] || now "$@"
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