Help grep one variable over other

Login or Register to Ask a Question and Join Our Community

Help grep one variable over other

Tags

Login to Discuss or Reply to this Discussion in Our Community

Top Forums Shell Programming and Scripting Help grep one variable over other

04-08-2013

Registered User

246, 1

Join Date: Apr 2009

Last Activity: 27 March 2020, 1:08 PM EDT

Posts: 246

Thanks Given: 9

Thanked 1 Time in 1 Post

Help grep one variable over other

Hi,

I am trying to grep one variable over the other variable

Example:

Code:

 
 
i=abc
j=ab
grep $j $i

I am getting this error:

Quote:

grep: can't open abc

The error is due to $i being variable and not file. I know I could do it by putting the value of abc in a file
and then greping it.

Code:

 
echo $i > temp.txt

But I would like to avoid creating unnecessary temp file.

Note: Depending on the return code of grep command I am planning to invoke other unix commands.

Help is appreciated to help achieve this.

pinnacle

View Public Profile for pinnacle

Find all posts by pinnacle

04-08-2013

Moderator

3,689, 1,352

Join Date: Jan 2012

Last Activity: 22 August 2020, 11:29 PM EDT

Location: Galactic Empire

Posts: 3,689

Thanks Given: 268

Thanked 1,352 Times in 1,258 Posts

Why don't you echo and then grep:

Code:

echo "$i" | grep "$j"

Yoda

View Public Profile for Yoda

Visit Yoda's homepage!

Find all posts by Yoda

Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

How to use $variable in grep?

hi i have a file which contains some messages counters. below is the snippet on the file. 17-05-29::22:36:21|message|231 17-05-29::22:36:31|message|222 17-05-29::22:36:41|message|213 17-05-30::22:36:51|message|221 17-05-30::22:37:01|message|227 17-05-30::22:37:11|message|207...

2. Shell Programming and Scripting

grep variable

I've got a file that I'm trying to grep through that looks like this: alpha1 alpha2 alpha3 beta1 beta2 gamma5 gamma6 gamma7 gamma8 gamma9 and I want the output to only contain the line with the highest value for each, so the output I want is: alpha3 beta2 gamma9 I also need...

3. Shell Programming and Scripting

grep in a variable

Hello, I usually search extensively and have to date found what I've needed. However, this one's got me stumped. I need to create a variable as follow. The issue however is that upon execution, it freezes. $var1 isn't always present in usage.log and this is fine but I'd like it to continue with...

4. Shell Programming and Scripting

grep using variable

I have a pattern like: column "5" is missing PS: the no is in double quotes. The number usally changes, so we use a loop to grep. grep 'column "$number" is missing' filename.txt But it is not working.... How to solve this?

5. Shell Programming and Scripting

Grep through a variable

I want to search a text in file but that file is pointing to variable. ex: file=there was nothing special grep "there was nothing" $file but its not working . Can u let me know that how we can use variable($file) in grep command. Please use code tags

6. Shell Programming and Scripting

grep using variable

how can I use grep with a variable to find a value? cat data.out Hello World grep "Hello World" data.out Hello World ## Value found I want to do something like this but can't seem to get it to work any suggestions would be appreciated. var="Hello World" grep $var data.out

7. Shell Programming and Scripting

grep a variable

can i grep a variable say i have a variable var=`hostname` and I want to make an if statement like if grep "esp-ueh" $var;then...... how can i do this I dont want to store this variable in a file and the grep it because my script will be used at the same time on multiple stations and then that...

8. Shell Programming and Scripting

grep a variable

Hi all, I am trying to do a simple thing in my mind. However I am fairly new to bash. What I need to do is create a folder for each partition on each CD, and each partition has a unique name (with spaces in it, do not ask why, it is already done :confused: ) . All CD's will show up...

9. Shell Programming and Scripting

grep with variable

Hi, I can't get this script to work (returns 0, should return 3): $ cat A.lst | \ while read LINE do echo "$LINE" grep -c "$LINE" B.tmp done> > > > > Socket 0 $ but in contrast this one works fine (returns 3 as expected): $ LINE=Socket $ grep -c $LINE B.tmp 3 $

10. Shell Programming and Scripting

How to grep a variable?

Hi, I'd like to grep a variable that I saved in the program. Like grep '0\$variable1' file1 Does someone know what's wrong with this command? Thanks a lot!

Login or Register to Ask a Question