我使用日期+“%T”打印开始和结束时间，结果如下:
10:33:56
10:36:10
我如何计算并打印这两者之间的差值呢?
我想要的是:
2m 14s
当前回答
我知道这是一篇较老的文章，但我今天在编写一个脚本时偶然发现了它，该脚本将从日志文件中获取日期和时间并计算delta。下面的脚本当然是多余的，我强烈建议检查我的逻辑和数学。
#!/bin/bash
dTime=""
tmp=""
#firstEntry="$(head -n 1 "$LOG" | sed 's/.*] \([0-9: -]\+\).*/\1/')"
firstEntry="2013-01-16 01:56:37"
#lastEntry="$(tac "$LOG" | head -n 1 | sed 's/.*] \([0-9: -]\+\).*/\1/')"
lastEntry="2014-09-17 18:24:02"
# I like to make the variables easier to parse
firstEntry="${firstEntry//-/ }"
lastEntry="${lastEntry//-/ }"
firstEntry="${firstEntry//:/ }"
lastEntry="${lastEntry//:/ }"
# remove the following lines in production
echo "$lastEntry"
echo "$firstEntry"
# compute days in last entry
for i in `seq 1 $(echo $lastEntry|awk '{print $2}')`; do {
case "$i" in
1|3|5|7|8|10|12 )
dTime=$(($dTime+31))
;;
4|6|9|11 )
dTime=$(($dTime+30))
;;
2 )
dTime=$(($dTime+28))
;;
esac
} done
# do leap year calculations for all years between first and last entry
for i in `seq $(echo $firstEntry|awk '{print $1}') $(echo $lastEntry|awk '{print $1}')`; do {
if [ $(($i%4)) -eq 0 ] && [ $(($i%100)) -eq 0 ] && [ $(($i%400)) -eq 0 ]; then {
if [ "$i" = "$(echo $firstEntry|awk '{print $1}')" ] && [ $(echo $firstEntry|awk '{print $2}') -lt 2 ]; then {
dTime=$(($dTime+1))
} elif [ $(echo $firstEntry|awk '{print $2}') -eq 2 ] && [ $(echo $firstEntry|awk '{print $3}') -lt 29 ]; then {
dTime=$(($dTime+1))
} fi
} elif [ $(($i%4)) -eq 0 ] && [ $(($i%100)) -ne 0 ]; then {
if [ "$i" = "$(echo $lastEntry|awk '{print $1}')" ] && [ $(echo $lastEntry|awk '{print $2}') -gt 2 ]; then {
dTime=$(($dTime+1))
} elif [ $(echo $lastEntry|awk '{print $2}') -eq 2 ] && [ $(echo $lastEntry|awk '{print $3}') -ne 29 ]; then {
dTime=$(($dTime+1))
} fi
} fi
} done
# substract days in first entry
for i in `seq 1 $(echo $firstEntry|awk '{print $2}')`; do {
case "$i" in
1|3|5|7|8|10|12 )
dTime=$(($dTime-31))
;;
4|6|9|11 )
dTime=$(($dTime-30))
;;
2 )
dTime=$(($dTime-28))
;;
esac
} done
dTime=$(($dTime+$(echo $lastEntry|awk '{print $3}')-$(echo $firstEntry|awk '{print $3}')))
# The above gives number of days for sample. Now we need hours, minutes, and seconds
# As a bit of hackery I just put the stuff in the best order for use in a for loop
dTime="$(($(echo $lastEntry|awk '{print $6}')-$(echo $firstEntry|awk '{print $6}'))) $(($(echo $lastEntry|awk '{print $5}')-$(echo $firstEntry|awk '{print $5}'))) $(($(echo $lastEntry|awk '{print $4}')-$(echo $firstEntry|awk '{print $4}'))) $dTime"
tmp=1
for i in $dTime; do {
if [ $i -lt 0 ]; then {
case "$tmp" in
1 )
tmp="$(($(echo $dTime|awk '{print $1}')+60)) $(($(echo $dTime|awk '{print $2}')-1))"
dTime="$tmp $(echo $dTime|awk '{print $3" "$4}')"
tmp=1
;;
2 )
tmp="$(($(echo $dTime|awk '{print $2}')+60)) $(($(echo $dTime|awk '{print $3}')-1))"
dTime="$(echo $dTime|awk '{print $1}') $tmp $(echo $dTime|awk '{print $4}')"
tmp=2
;;
3 )
tmp="$(($(echo $dTime|awk '{print $3}')+24)) $(($(echo $dTime|awk '{print $4}')-1))"
dTime="$(echo $dTime|awk '{print $1" "$2}') $tmp"
tmp=3
;;
esac
} fi
tmp=$(($tmp+1))
} done
echo "The sample time is $(echo $dTime|awk '{print $4}') days, $(echo $dTime|awk '{print $3}') hours, $(echo $dTime|awk '{print $2}') minutes, and $(echo $dTime|awk '{print $1}') seconds."
您将得到如下输出。
2012 10 16 01 56 37
2014 09 17 18 24 02
The sample time is 700 days, 16 hours, 27 minutes, and 25 seconds.
我修改了一点脚本，使其独立(即。只是设置变量值)，但也许总体思想也是如此。您可能需要对负值进行额外的错误检查。
其他回答
这是我的bash实现(bit从其他SO;-)
function countTimeDiff() {
timeA=$1 # 09:59:35
timeB=$2 # 17:32:55
# feeding variables by using read and splitting with IFS
IFS=: read ah am as <<< "$timeA"
IFS=: read bh bm bs <<< "$timeB"
# Convert hours to minutes.
# The 10# is there to avoid errors with leading zeros
# by telling bash that we use base 10
secondsA=$((10#$ah*60*60 + 10#$am*60 + 10#$as))
secondsB=$((10#$bh*60*60 + 10#$bm*60 + 10#$bs))
DIFF_SEC=$((secondsB - secondsA))
echo "The difference is $DIFF_SEC seconds.";
SEC=$(($DIFF_SEC%60))
MIN=$((($DIFF_SEC-$SEC)%3600/60))
HRS=$((($DIFF_SEC-$MIN*60)/3600))
TIME_DIFF="$HRS:$MIN:$SEC";
echo $TIME_DIFF;
}
$ countTimeDiff 2:15:55 2:55:16
The difference is 2361 seconds.
0:39:21
未测试，可能有bug。
截至目前(GNU coreutils) 7.4，你现在可以使用-d来做算术:
$ date -d -30days
Sat Jun 28 13:36:35 UTC 2014
$ date -d tomorrow
Tue Jul 29 13:40:55 UTC 2014
你可以使用的单位是天、年、月、小时、分钟和秒:
$ date -d tomorrow+2days-10minutes
Thu Jul 31 13:33:02 UTC 2014
我知道这是一篇较老的文章，但我今天在编写一个脚本时偶然发现了它，该脚本将从日志文件中获取日期和时间并计算delta。下面的脚本当然是多余的，我强烈建议检查我的逻辑和数学。
#!/bin/bash
dTime=""
tmp=""
#firstEntry="$(head -n 1 "$LOG" | sed 's/.*] \([0-9: -]\+\).*/\1/')"
firstEntry="2013-01-16 01:56:37"
#lastEntry="$(tac "$LOG" | head -n 1 | sed 's/.*] \([0-9: -]\+\).*/\1/')"
lastEntry="2014-09-17 18:24:02"
# I like to make the variables easier to parse
firstEntry="${firstEntry//-/ }"
lastEntry="${lastEntry//-/ }"
firstEntry="${firstEntry//:/ }"
lastEntry="${lastEntry//:/ }"
# remove the following lines in production
echo "$lastEntry"
echo "$firstEntry"
# compute days in last entry
for i in `seq 1 $(echo $lastEntry|awk '{print $2}')`; do {
case "$i" in
1|3|5|7|8|10|12 )
dTime=$(($dTime+31))
;;
4|6|9|11 )
dTime=$(($dTime+30))
;;
2 )
dTime=$(($dTime+28))
;;
esac
} done
# do leap year calculations for all years between first and last entry
for i in `seq $(echo $firstEntry|awk '{print $1}') $(echo $lastEntry|awk '{print $1}')`; do {
if [ $(($i%4)) -eq 0 ] && [ $(($i%100)) -eq 0 ] && [ $(($i%400)) -eq 0 ]; then {
if [ "$i" = "$(echo $firstEntry|awk '{print $1}')" ] && [ $(echo $firstEntry|awk '{print $2}') -lt 2 ]; then {
dTime=$(($dTime+1))
} elif [ $(echo $firstEntry|awk '{print $2}') -eq 2 ] && [ $(echo $firstEntry|awk '{print $3}') -lt 29 ]; then {
dTime=$(($dTime+1))
} fi
} elif [ $(($i%4)) -eq 0 ] && [ $(($i%100)) -ne 0 ]; then {
if [ "$i" = "$(echo $lastEntry|awk '{print $1}')" ] && [ $(echo $lastEntry|awk '{print $2}') -gt 2 ]; then {
dTime=$(($dTime+1))
} elif [ $(echo $lastEntry|awk '{print $2}') -eq 2 ] && [ $(echo $lastEntry|awk '{print $3}') -ne 29 ]; then {
dTime=$(($dTime+1))
} fi
} fi
} done
# substract days in first entry
for i in `seq 1 $(echo $firstEntry|awk '{print $2}')`; do {
case "$i" in
1|3|5|7|8|10|12 )
dTime=$(($dTime-31))
;;
4|6|9|11 )
dTime=$(($dTime-30))
;;
2 )
dTime=$(($dTime-28))
;;
esac
} done
dTime=$(($dTime+$(echo $lastEntry|awk '{print $3}')-$(echo $firstEntry|awk '{print $3}')))
# The above gives number of days for sample. Now we need hours, minutes, and seconds
# As a bit of hackery I just put the stuff in the best order for use in a for loop
dTime="$(($(echo $lastEntry|awk '{print $6}')-$(echo $firstEntry|awk '{print $6}'))) $(($(echo $lastEntry|awk '{print $5}')-$(echo $firstEntry|awk '{print $5}'))) $(($(echo $lastEntry|awk '{print $4}')-$(echo $firstEntry|awk '{print $4}'))) $dTime"
tmp=1
for i in $dTime; do {
if [ $i -lt 0 ]; then {
case "$tmp" in
1 )
tmp="$(($(echo $dTime|awk '{print $1}')+60)) $(($(echo $dTime|awk '{print $2}')-1))"
dTime="$tmp $(echo $dTime|awk '{print $3" "$4}')"
tmp=1
;;
2 )
tmp="$(($(echo $dTime|awk '{print $2}')+60)) $(($(echo $dTime|awk '{print $3}')-1))"
dTime="$(echo $dTime|awk '{print $1}') $tmp $(echo $dTime|awk '{print $4}')"
tmp=2
;;
3 )
tmp="$(($(echo $dTime|awk '{print $3}')+24)) $(($(echo $dTime|awk '{print $4}')-1))"
dTime="$(echo $dTime|awk '{print $1" "$2}') $tmp"
tmp=3
;;
esac
} fi
tmp=$(($tmp+1))
} done
echo "The sample time is $(echo $dTime|awk '{print $4}') days, $(echo $dTime|awk '{print $3}') hours, $(echo $dTime|awk '{print $2}') minutes, and $(echo $dTime|awk '{print $1}') seconds."
您将得到如下输出。
2012 10 16 01 56 37
2014 09 17 18 24 02
The sample time is 700 days, 16 hours, 27 minutes, and 25 seconds.
我修改了一点脚本，使其独立(即。只是设置变量值)，但也许总体思想也是如此。您可能需要对负值进行额外的错误检查。
或者把它包起来一点
alias timerstart='starttime=$(date +"%s")'
alias timerstop='echo seconds=$(($(date +"%s")-$starttime))'
这样就行了。
timerstart; sleep 2; timerstop
seconds=2
日期可以给你的差异和格式为您(OS X选项显示)
date -ujf%s $(($(date -jf%T "10:36:10" +%s) - $(date -jf%T "10:33:56" +%s))) +%T
# 00:02:14
date -ujf%s $(($(date -jf%T "10:36:10" +%s) - $(date -jf%T "10:33:56" +%s))) \
+'%-Hh %-Mm %-Ss'
# 0h 2m 14s
某些字符串处理可以删除这些空值
date -ujf%s $(($(date -jf%T "10:36:10" +%s) - $(date -jf%T "10:33:56" +%s))) \
+'%-Hh %-Mm %-Ss' | sed "s/[[:<:]]0[hms] *//g"
# 2m 14s
如果你把较早的时间放在前面，这是行不通的。如果你需要处理,改变$(($(日期 ...) - $( 日期……)))(echo $(美元日期 ...) - $( 公元前日期…)| | tr - d -)
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