Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

grep embedded in a variable

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting grep embedded in a variable
# 1  
Old 04-13-2005
grep embedded in a variable
Hi ,

well at the beginning i simply type :

cat file.1|grep 'update process'

but for looping and table needs , i wanted to do the following :

var1="grep 'update process'"
cat file1|"var1"

and i got error :

grep: can't open update
grep: can't open process


when it works if i have only :
var1="grep update"


thanks in advance
Christian
# 2  
Old 04-13-2005
try using
var1=`grep "update process"`
# 3  
Old 04-13-2005
eval ${var1} file1
# 4  
Old 04-13-2005
Great , the eval is right way for me !

thanks a lot !

Christian
# 5  
Old 04-14-2005
well some more.............

.....if the var1 pipe , it doesn't work :

var1=`grep "update process"|tail -1`

christian
# 6  
Old 04-14-2005
Try

var1='grep "update process" file_name | tail -1'
eval ${var1}
# 7  
Old 04-14-2005
well that's right , it's become a little bit complicated .
At the beginning i wished to build a table with separated variables , var1 would be one variable.

I will look for another way to do !

thanks

Christian
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... (5 Replies)
Discussion started by: scriptor
5 Replies

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... (11 Replies)
Discussion started by: tiberione
11 Replies

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... (6 Replies)
Discussion started by: shadyuk
6 Replies

4. 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 (3 Replies)
Discussion started by: BeefStu
3 Replies

5. Shell Programming and Scripting

Assigning return value of an embedded SQL in a shell script variable

I've a script of the following form calling a simple sql that counts the no of rows as based on some conditions. I want the count returned by the sql to get assigned to the variable sql_ret_val1. However I'm finding that this var is always getting assigned a value of 0. I have verified by executing... (1 Reply)
Discussion started by: MxC
1 Replies

6. 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... (9 Replies)
Discussion started by: lassimanji
9 Replies

7. 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... (2 Replies)
Discussion started by: sgstuart
2 Replies

8. 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 $ (5 Replies)
Discussion started by: ozvena
5 Replies

9. Shell Programming and Scripting

Strip leading and trailing spaces only in a shell variable with embedded spaces

I am trying to strip all leading and trailing spaces of a shell variable using either awk or sed or any other utility, however unscuccessful and need your help. echo $SH_VAR | command_line Syntax. The SH_VAR contains embedded spaces which needs to be preserved. I need only for the leading and... (6 Replies)
Discussion started by: jerardfjay
6 Replies

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! (2 Replies)
Discussion started by: whatisthis
2 Replies
Login or Register to Ask a Question