Visit Our UNIX and Linux User Community


Help needed sed command.


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Help needed sed command.
# 1  
Old 11-05-2009
Help needed sed command.

I want to execute below command using line number as a variable.
Code:
sed '5c\ disk = jskdjfdsk' vm.cfg

How do i substitute a variable in place of 5
for example
i tried substituting
Code:
sed '$variablec\ disk = jskdjfdsk' vm.cfg
and 
sed '"$variable"c\ disk = jskdjfdsk' vm.cfg)

but they didnt worked .
Please help
# 2  
Old 11-05-2009
Double quote your sed and use the variable as ${variable}

i.e.
Code:
sed "${variable}c\ disk = jskdjfdsk" vm.cfg

Or put a space after it:
Code:
sed "$variable c\ disk = jskdjfdsk" vm.cfg

to separate it from the character c
# 3  
Old 11-05-2009
Quote:
Originally Posted by pinga123
Code:
sed '$variablec\ disk = jskdjfdsk' vm.cfg
and 
sed '"$variable"c\ disk = jskdjfdsk' vm.cfg)

Drop the single quotes and bring in double quotes. Single quotes prevent variable expansion.

Try if this works
Code:
sed "${variable}c\ disk = jskdjfdsk" vm.cfg


Previous Thread | Next Thread
Test Your Knowledge in Computers #387
Difficulty: Medium
The Unix apropos utility locates commands using a neural network.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Help needed with file output awk sed command - please

Hi I have a file that contains lines starting with a particular string plus a Colon: I need to output all these lines but only what comes after the colon Can you pelase assist? Example of lines in the file: com.ubs.f35.cashequities/cashequities: 1 2 ... (5 Replies)
Discussion started by: mnassiri
5 Replies

2. Shell Programming and Scripting

Help needed - ksh: sed: command garbled:

Hi all, What am I doing wrong here? $ cat test_sed.ksh #!/usr/bin/ksh var="sed -e \'6s/9/6/\' testfile.txt > testfile.txt.2" $var $ ./test_sed.ksh sed: command garbled: \'6s/9/6/\' Thank you! (4 Replies)
Discussion started by: ejianu
4 Replies

3. Shell Programming and Scripting

sed command help needed.

vif = I need to replace "00:16:3E:64:FB:D3" to a new mac address value from below mentioned file. # cat vm.cfg acpi = 1 apic = 1 builder = 'hvm' device_model = '/usr/lib/xen/bin/qemu-dm' disk = kernel = '/usr/lib/xen/boot/hvmloader' memory = '300' name = 'vm_temp' on_crash =... (1 Reply)
Discussion started by: pinga123
1 Replies

4. UNIX for Dummies Questions & Answers

Help needed on sed command

Hi, I am splitting a file based on pattern using sed -f command as below: sed_cmd2 is the Pattern filename which has the below mentioned pattern in it: #n /\(.*\) \(.*\) \(mith\).*/w smith Input file has following data 1 John Smith Chicago 2 Mary Smith New York 3 Judy... (2 Replies)
Discussion started by: 12345
2 Replies

5. Shell Programming and Scripting

Help needed in sed

I have a requirement in my project to create report from a template file. A sample template file is added below: The report data is stored in a file. A sample data file is added below: Using the above template and data file I want to create a report like this: I have tried to... (1 Reply)
Discussion started by: Alecs
1 Replies

6. Shell Programming and Scripting

flexible sed command needed to handle multiple input types

Hello, I need a smart sed command that can take any of the following two as an input and give below mentioned output. As you can see, I am trying to convert some C code INPUT: struct abc_sample1 { char myString; UINT16 myValue1; ... (2 Replies)
Discussion started by: SiftinDotCom
2 Replies

7. Shell Programming and Scripting

SED command ---------help needed

Hi all I am new babie to shell script, so please advise me n help me . suppose i have a string "abacus sabre", i need to replace occurences 'ab' with 'cd' and i need to store this result into same string and i need to return this result from script to the calling function, where as the string... (4 Replies)
Discussion started by: veerapureddy
4 Replies

8. Shell Programming and Scripting

sed command explanation needed

Hi, Could you please explain me the below statement -- phrase wise. sed -e :a -e '$q;N;'$cnt',$D;ba' abc.txt > xyz.txt if suppose $cnt contains value: 10 it copies last 9 lines of abc.txt to xyz.txt why it is copying last 9 rather than 10. and also what is ba and $D over there in... (4 Replies)
Discussion started by: subbukns
4 Replies

9. Shell Programming and Scripting

Help needed in processing multiple variables in a single sed command.

Is it possible to process multiple variables in a single sed command? I have the following ksh with three variables and I want to search for all variables which start with "var" inside input.txt. I tired "$var$" but it just prints out everyting in input.txt and does not work. $ more test.ksh... (5 Replies)
Discussion started by: stevefox
5 Replies

10. UNIX for Dummies Questions & Answers

help needed for sed command

Hi all, I need some help with sed command. I'm trying to move all the files with a modified date within 12:00 - 13:00. What i'm doing here is to do is ls -lt | grep 'Jun 22 12:' > list.txt to get all file names within that period. However how do i strip off -rw-r--r-- 1 enfoot adi... (2 Replies)
Discussion started by: manualvin
2 Replies

Featured Tech Videos