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[php]
#! /bin/sh
# '@(#)tzselect.ksh 1.7'
# Ask the user about the time zone, and output the resulting TZ value to stdout.
# Interact with the user via stderr and stdin.
# Contributed by Paul Eggert <eggert@twinsun.com>.
# Porting notes:
#
# This script requires several features of the Korn shell.
# If your host lacks the Korn shell,
# you can use either of the following free programs instead:
#
# <a href=ftp://ftp.gnu.org/pub/gnu/>
# Bourne-Again shell (bash)
# </a>
#
# <a href=ftp://ftp.cs.mun.ca/pub/pdksh/pdksh.tar.gz>
# Public domain ksh
# </a>
#
# This script also uses several features of modern awk programs.
# If your host lacks awk, or has an old awk that does not conform to Posix.2,
# you can use either of the following free programs instead:
#
# <a href=ftp://ftp.gnu.org/pub/gnu/>
# GNU awk (gawk)
# </a>
#
# <a href=ftp://ftp.whidbey.net/pub/brennan/>
# mawk
# </a>
if [ "${1}" != "" ] ; then
if [ "${1}" = "-show" ] ; then
MYTZVAL=`ls -l /etc/localtime | awk '{print $11}' | sed 's/[/]usr[/]share[/]zoneinfo[/]//g'`
if [ -z "${MYTZVAL}" ] ; then
echo "Time zone is not set." 2>&1
exit 1
else
echo "${MYTZVAL}" 2>&1
fi
else
echo "Usage: timezone [-show | --help]"
fi
exit 0
fi
# Specify default values for environment variables if they are unset.
: ${AWK=awk}
: ${TZDIR=/usr/share/zoneinfo}
: ${POSIX_TZ=0}
# Check for awk Posix compliance.
($AWK -v x=y 'BEGIN { exit 123 }') </dev/null >/dev/null 2>&1
[ $? = 123 ] || {
echo >&2 "$0: Sorry, your \`$AWK' program is not Posix compatible."
exit 1
}
# Make sure the tables are readable.
TZ_COUNTRY_TABLE=$TZDIR/iso3166.tab
TZ_ZONE_TABLE=$TZDIR/zone.tab
for f in $TZ_COUNTRY_TABLE $TZ_ZONE_TABLE
do
<$f || {
echo >&2 "$0: time zone files are not set up correctly"
exit 1
}
done
newline='
'
IFS=$newline
# Work around a bug in bash 1.14.7 and earlier, where $PS3 is sent to stdout.
case $(echo 1 | (select x in x; do break; done) 2>/dev/null) in
?*) PS3='------------------------------------------------------------------
Your choice: '
esac
# Begin the main loop. We come back here if the user wants to retry.
while
echo >&2 'Identify a location' \
'so that time zone rules can be set correctly.'
continent=
country=
region=
# Ask the user for continent or ocean.
echo >&2 'Select a continent or ocean.'
select continent in \
Africa \
Americas \
Antarctica \
'Arctic Ocean' \
Asia \
'Atlantic Ocean' \
Australia \
Europe \
'Indian Ocean' \
'Pacific Ocean' \
'none - I want to specify the time zone using the Posix TZ format.' \
'cancel - I want to quit without changing the time zone.'
do
case $continent in
'')
echo >&2 'Enter a number in range.';;
?*)
case $continent in
Americas) continent=America;;
*' '*) continent=$(expr "$continent" : '\([^ ]*\)')
esac
break
esac
done
case $continent in
'')
exit 1;;
cancel)
exit 1;;
none)
# Ask the user for a Posix TZ string. Check that it conforms.
while
echo >&2 'Enter the desired value' \
'of the TZ environment variable.'
echo >&2 'For example, GST-10 is a zone named GST' \
'that is 10 hours ahead (east) of UTC.'
echo >&2 'Enter "cancel" to quit without setting the time zone.'
read TZ
if [ "${TZ}" = "cancel" ] ; then
exit 1
fi
$AWK -v TZ="$TZ" 'BEGIN {
tzname = "[^-+,0-9][^-+,0-9][^-+,0-9]+"
time = "[0-2]?[0-9](:[0-5][0-9](:[0-5][0-9])?)?"
offset = "[-+]?" time
date = "(J?[0-9]+|M[0-9]+\.[0-9]+\.[0-9]+)"
datetime = "," date "(/" time ")?"
tzpattern = "^(:.*|" tzname offset "(" tzname \
"(" offset ")?(" datetime datetime ")?)?)$"
if (TZ ~ tzpattern) exit 1
exit 0
}'
do
echo >&2 "\`$TZ' is not a conforming" \
'Posix time zone string.'
done
POSIX_TZ=1
TZ_for_date=$TZ;;
*)
# Get list of names of countries in the continent or ocean.
countries=$($AWK -F'\t' \
-v continent="$continent" \
-v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
'
/^#/ { next }
$3 ~ ("^" continent "/") {
if (!cc_seen[$1]++) cc_list[++ccs] = $1
}
END {
while (getline <TZ_COUNTRY_TABLE) {
if ($0 !~ /^#/) cc_name[$1] = $2
}
for (i = 1; i <= ccs; i++) {
country = cc_list
if (cc_name[country]) {
country = cc_name[country]
}
print country
}
}
' <$TZ_ZONE_TABLE | sort -f)
# If there's more than one country, ask the user which one.
case $countries in
*"$newline"*)
echo >&2 'Select a country.'
select country in $countries cancel
do
case $country in
'') echo >&2 'Enter a number in range.';;
?*) break
esac
done
case $country in
'') exit 1 ;;
cancel) exit 1
esac;;
*)
country=$countries
esac
# Get list of names of time zone rule regions in the country.
regions=$($AWK -F'\t' \
-v country="$country" \
-v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
'
BEGIN {
cc = country
while (getline <TZ_COUNTRY_TABLE) {
if ($0 !~ /^#/ && country == $2) {
cc = $1
break
}
}
}
$1 == cc { print $4 }
' <$TZ_ZONE_TABLE)
# If there's more than one region, ask the user which one.
case $regions in
*"$newline"*)
echo >&2 'Select one of the following' \
'time zone regions.'
select region in $regions cancel
do
case $region in
'') echo >&2 'Enter a number in range.';;
?*) break
esac
done
case $region in
'') exit 1 ;;
cancel) exit 1
esac;;
*)
region=$regions
esac
# Determine TZ from country and region.
TZ=$($AWK -F'\t' \
-v country="$country" \
-v region="$region" \
-v TZ_COUNTRY_TABLE="$TZ_COUNTRY_TABLE" \
'
BEGIN {
cc = country
while (getline <TZ_COUNTRY_TABLE) {
if ($0 !~ /^#/ && country == $2) {
cc = $1
break
}
}
}
$1 == cc && $4 == region { print $3 }
' <$TZ_ZONE_TABLE)
# Make sure the corresponding zoneinfo file exists.
TZ_for_date=$TZDIR/$TZ
<$TZ_for_date || {
echo >&2 "$0: time zone files are not set up correctly"
exit 1
}
esac
# Use the proposed TZ to output the current date relative to UTC.
# Loop until they agree in seconds.
# Give up after 8 unsuccessful tries.
extra_info=
for i in 1 2 3 4 5 6 7 8
do
TZdate=$(LANG=C TZ="$TZ_for_date" date)
UTdate=$(LANG=C TZ=UTC0 date)
TZsec=$(expr "$TZdate" : '.*:\([0-5][0-9]\)')
UTsec=$(expr "$UTdate" : '.*:\([0-5][0-9]\)')
case $TZsec in
$UTsec)
extra_info="
Local time is now: $TZdate.
Universal Time is now: $UTdate."
break
esac
done
# Output TZ info and ask the user to confirm.
echo >&2 ""
echo >&2 "The following information has been given:"
echo >&2 ""
case $country+$region in
?*+?*) echo >&2 " $country$newline $region";;
?*+) echo >&2 " $country";;
+) echo >&2 " TZ='$TZ'"
esac
echo >&2 ""
echo >&2 "Therefore TZ='$TZ' will be used.$extra_info"
echo >&2 "Is the above information OK?"
ok=
select ok in Yes No Cancel
do
case $ok in
'') echo >&2 'Enter 1 for Yes, 2 for No, or 3 for Cancel.';;
?*) break
esac
done
case $ok in
'') exit 1;;
Cancel) exit 1;;
Yes) break
esac
do :
done
case $SHELL in
*csh) file=.login line="setenv TZ '$TZ'";;
*) file=.profile line="TZ='$TZ'; export TZ"
esac
# echo >&2 "
# You can make this change permanent for yourself by appending the line
# $line
# to the file '$file' in your home directory; then log out and log in again.
#
# Here is that TZ value again, this time on standard output so that you
# can use the $0 command in shell scripts:"
rm -f /etc/localtime
if [ "$POSIX_TZ" == "0" ]; then
ln -s "${TZDIR}/${TZ}" /etc/localtime
else
ln -s "${TZDIR}/Etc/${TZ}" /etc/localtime
fi
echo $TZ > /etc/localtime.tz
hwclock --systohc --localtime
hwclock --hctosys --localtime
echo "Updating time zone succeded." 2>&1
# echo "$TZ"
[/php]
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发表于 2005-7-19 14:39:55
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发表于 2005-7-20 08:08:55
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