92 lines
3.3 KiB
Bash
Executable file
92 lines
3.3 KiB
Bash
Executable file
#!/bin/bash
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# timein--Shows the current time in the specified time zone or
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# geographic zone. Without any argument, this shows UTC/GMT.
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# Use the word "list" to see a list of known geographic regions.
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# Note that it's possible to match zone directories (regions),
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# but that only time zone files (cities) are valid specifications.
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# Time zone database ref: http://www.twinsun.com/tz/tz-link.htm
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zonedir="/usr/share/zoneinfo"
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if [ ! -d $zonedir ] ; then
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echo "No time zone database at $zonedir." >&2
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exit 1
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fi
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if [ -d "$zonedir/posix" ] ; then
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zonedir=$zonedir/posix # Modern Linux systems
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fi
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if [ $# -eq 0 ] ; then
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timezone="UTC"
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mixedzone="UTC"
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elif [ "$1" = "list" ] ; then
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(
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echo "All know time zones and regions defined on this system:"
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cd $zonedir
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find -L * -type f -print | xargs -n 2 | \
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awk '{printf " %-38s\n", $1, $2 }'
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) | more
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exit 0
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else
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region="$(dirname $1)"
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zone="$(basename $1)"
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# Is the given time zone a direct match? If so, we're good to go.
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# Otherwise we need to dig around a bit to find things. Start by
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# just counting matches.
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matchcnt="$(find -L $zonedir -name $zone -type f -print |\
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wc -l | sed 's/[^[:digit:]]//g')"
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# Check if at least one file matches.
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if [ "$matchcnt" -gt 0 ] ; then
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# But exit if more than one file matches.
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if [ $matchcnt -gt 1 ] ; then
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echo "\"$zone\" matches more than one possible time zone record." >&2
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echo "Please use 'list' to see all known regions and time zones." >&2
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exit 1
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fi
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match="$(find -L $zonedir -name $zone -type f -print)"
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mixedzone="$zone"
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else # Maybe we can find a matching time zone region, ratgher than a specifications
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# time zone.
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# First letter capitlized, rest of word lowercase for region + zone
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mixedreegion="$(echo ${region%${region#?}} \
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| tr '[[:lower:]]' '[[:upper:]]') \
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$(echo ${region#?} | tr '[[:upper:]]' '[[:lower:]]')"
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mixedzone="$(echo ${zone%${zone#?}} | tr '[[:lower:]]' '[[:upper:]]') \
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$(echo ${zone#?} | tr '[[:upper:]]' '[[:lower:]]')"
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if [ "$mixedregion" != "." ] ; then
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# Only look for specified zone in specified region
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# to let users specify unique matches when there's
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# more than one possibility (e.g., "Atlantic").
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match="$(find -L $zondir/$mixedregion -type f -name $mixedzone -print)"
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else
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match="$(find -L $zonedir -name $mixedzone -type f -print)"
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fi
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# If file exactly matched the specified pattern
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if [ -z "$match" ] ; then
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# Check if the pattern was too ambiguous.
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if [ ! -z $(find -L $zonedir -name $mixedzone -type d -print) ] ; then
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echo "The region \"$1\" has more than one time zone. " >&2
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else # Or if it just didn't produce any matches at all
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echo "Can't find an exact match for \"$1\". " >&2
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fi
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echo "Please use 'list' to see all known regions and time zones." >&2
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exit 1
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fi
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fi
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timezone="$match"
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fi
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nicetz=$(echo $timezone | sed "s|$zonedir/||g") # Pretty up the output.
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echo It\'s $(TZ=$timezone date '+%A, %B %e, %Y, at %l:%M %p') in $nicetz
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exit 0
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