how to subtract variables

Tags

intersection of 2 variables, shell scripts

Top Forums Shell Programming and Scripting how to subtract variables

08-04-2010

Registered User

10, 0

Join Date: Apr 2010

Last Activity: 18 January 2013, 1:59 AM EST

Posts: 10

Thanks Given: 2

Thanked 0 Times in 0 Posts

how to subtract variables

i have
var1=abc def

var2=abc

I want to do var1-var2 ie i want def how can i do it?

Thanks please help

javaholics

View Public Profile for javaholics

Find all posts by javaholics

08-04-2010

Administrator Emeritus

9,179, 1,331

Join Date: Jun 2009

Last Activity: 26 February 2019, 5:57 PM EST

Posts: 9,179

Thanks Given: 430

Thanked 1,331 Times in 1,120 Posts

Bash and (newer) KSH:

Code:

$ var1="abc def"
$ var2=abc
$ echo ${var1/$var2/}
def

Scott

View Public Profile for Scott

Find all posts by Scott

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Need to recalculate (subtract) before a reformat.

We are having to read a number of files from an outside source and have been given a layout that looks like this LNPDTO 383 8 DATE Comment LNACIN 391 14 S2 Comment LNDEFI 405 14 S2 Comment LNYTDI 419 14 S2 ...

2. Shell Programming and Scripting

Subtract time in two line

INPUT: 16:45:51 10051 77845 16:45:51 10051 77845 16:46:52 10051 77846 16:46:53 10051 77846 Match the last PID then subtract second line time with first line. Please help me with any command or script.

3. Solaris

Subtract 2 days from timestamp

Hi, I am running on Solaris 11.3. I have a timestamp in this format date +%Y%m%d%H%M . I found some forums saying to use date --d however that didn't work. Is there a way how I can subtract days from timestamp in that format? Thanks

4. UNIX for Dummies Questions & Answers

Subtract minutes from date

Hi, I am reading a particular date from a file using below command WFLWDATE=$(sed '2q;d' FileA.prm) The echo command outputs the correct date in variable WFLWDATE Now I want to subtract 5 minutes from this variable. I am on AIX and unable to get anything working as expected. Can you...

5. Shell Programming and Scripting

Subtract two variable

plz help me in simple calculation. Have to substract two variable (in Bytes) and change the output into MB. A=`more /tmp/size_info_old.out |awk NR==3` echo "$A" > /tmp/rav/A.out B=`more /tmp/size_info.out |awk NR==3` echo "$B" > /tmp/B.out C=$(((B-A))/1024/1024) echo "$C"...

6. Shell Programming and Scripting

How to subtract a number from all columns?

Hi, I want to subtract a number from all columns except the first column. I have a number of files each having different columns around 60/70. How to do that in awk or any other command? Thanks Input Col 1 Col 2 Col3 - - - - Col55 1 .0123 .098 - - - 0.6728 2 - -...

7. Shell Programming and Scripting

Script to subtract rows HELP

Dear All, Please help with a script which can accomplish the following: Input table: $1 $2 $3 Student1 1 50 Student2 56 75 Student3 77 100 Desired Output: $1 $2 $3 $4 Student1 1 50 Student2 56 75 6 Student3 77 ...

8. Shell Programming and Scripting

Subtract field values

I've got a long logfile of the form network1:123:45:6789:01:234:56 network2:12:34:556:778:900:12 network3:... I've got a similar logfile from a week later with different values for each of the fields eg network1:130:50:6800:10:334:66 network2:18:40:600:800:999:20 network3:... ...

9. Shell Programming and Scripting

Subtract Time

Hello, Im writing a script using the ksh shell. I have 2 variables in the script: CURRTIME PREVTIME Example, if CURRTIME=13:00, I want to somehow calculate what the time was an hour ago so that PREVTIME=12:00 Right now I have the following: CURRTIME=`date +%H:%M` How can I...

10. UNIX for Dummies Questions & Answers

Subtract two dates in different lines

Hi Friends :) I have a long file having fields in the form : Field1 yy/mm/dd hh:mm:ss Duration(Sec) line 1) 123123 05/11/30 12:12:56 145 line 2) 145235 05/11/30 12:15:15 30 line 3) 145264 05/11/30 13:14:56 178 . . I want to...

Shell Programming and Scripting