How to change time and compare it in shell script

Question

I am using a script to compare time but getting the error, Quarterly_File.sh: line 139: [[: 0148: value too great for base (error token is "0142"). Is there any way I could change my inputs in time (hour) format and compare it with other time? My inputs are as follows.

startTime=00:45
endTime=01:30
fileTime=01:42

I am simply comparing them by removing : between them, like below.

if (0142 -ge 0045 && 0142 -lt 0130)
    then 
    // my logic
fi

Note that time range could be anything within a one-hour range.

Examples

0000    0045,
0030    0130,
2345    0014 (of next day)

You are not comparing time, from the docs "Constants with a leading 0 are interpreted as octal numbers". — schrodingerscatcuriosity
– schrodingerscatcuriosity, Commented Oct 24, 2019 at 14:57
Anyway, you have to convert the dates to seconds and then perform the ops. — schrodingerscatcuriosity
– schrodingerscatcuriosity, Commented Oct 24, 2019 at 15:20

Community · Accepted Answer · 2020-06-11 14:16:50Z

Not sure how you're going to use ( and ) with bash operators ~~however this would work:~~

~~if [ 0142 -ge 0045 ] && [ 0142 -lt 0130 ]; then echo "yep" fi~~

~~If that's not what you're looking for, please paste as much relevant code as possible.~~

edit:

As pointed out in the comments below, this would indeed cause issues as it's comparing octal numbers to (eventually after 10am) decimal numbers

I would recommend using date to convert time to seconds, then compare that.

An example would be:

# grab these however you are currently
time1="01:42"
time2="00:45"
time3="01:42"
time4="01:30"

time1Second=$(date -d "${time1}" +%s)
time2Second=$(date -d "${time2}" +%s)
time3Second=$(date -d "${time3}" +%s)
time4Second=$(date -d "${time4}" +%s)

# then your comparison operators and logic:
if [ "$time1Second" -ge "$time2Second" ] && [ "$time3Second" -lt "$time4second" ]; then
    # logic here
    echo true
fi

This way, you are always comparing numbers in the same base

spot on, cheers. forgot how bash handles octal. Edited

RobotJohnny
– RobotJohnny

2019-10-24 15:22:36 +00:00
Commented Oct 24, 2019 at 15:22 — RobotJohnny
– RobotJohnny, Commented Oct 24, 2019 at 15:22

Chris Davies · Accepted Answer · 2019-10-24 15:30:35Z

0

Convert the times to minutes and compare those

startTime=00:45
fileTime=01:42

hr=${startTime/:*} mn=${startTime/*:}      # Split hh:mm into hours and minutes
startMins=$(( ${hr#0} * 60 + ${mn#0} ))    # Minutes since midnight

hr=${fileTime/:*} mn=${fileTime/*:}
fileMins=$(( ${hr#0} * 60 + ${mn#0} ))

if [[ $fileMins -ge $startMins ]]; then : ...; fi

edited Oct 24, 2019 at 15:30

answered Oct 24, 2019 at 15:24

Chris Davies

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