sed -i option example

Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers sed -i option example
# 1  
Old 06-22-2011
Bug sed -i option example

Can anyone give detailed and example for sed -i option.
Where can we use this option?Smilie
# 2  
Old 06-22-2011
sed -i is used to make the changes to a original file

see the below example

bash-3.00$ echo "abc" > test.txt

bash-3.00$ sed 's/abc/efg/' test.txt

bash-3.00$ cat test.txt

bash-3.00$ sed -i 's/abc/efg/' test.txt

bash-3.00$ cat test.txt

# 3  
Old 06-22-2011
-i option stands for "in-place" editing. It is used to modify the file without the need to save the output of sed command to some temporary file and then replacing the original file. For example instead of:
sed 's/a/b/g' file > file.tmp; mv file.tmp file

you can do:
sed -i 's/a/b/g' file

# 4  
Old 06-22-2011
thanks itkamaraj and bartus11... i understood....
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

sed one Liner option -e

Hi, I have the following command.(Delete all trailing blank lines at the end of a file.) sed -e :a -e '/^\n*$/{$d;N;ba' -e '}' I don't understand the logic of this command and also I don't understand why -e is used. Can you please let me know the logic of this command and why three -e... (5 Replies)
Discussion started by: TomG
5 Replies

2. Shell Programming and Scripting

sed -n option

Hi i am facing problem with sed -n option could you please help me on this, i have a file test the contents of the file is width="75">10/0 4/12</td>^M><a href='courtorders/100412zr.pdf' target="_blank">Miscellaneous Order</a></td>^M width="75">10/01/12</td>^M><a href='courtorde... (8 Replies)
Discussion started by: ragilla
8 Replies

3. Shell Programming and Scripting

sed with -e option

sed "s/^/8,A1,$dat,id2_3,/g" -e sed "s/$/,,,,,,,,,,,/g" temporary wn m running this script m getting a error... plz help me with this.... O/p sed: -e expression #1, char 3: unterminated `s' command ---------- Post updated at 11:35 AM ---------- Previous update was at 11:33 AM... (7 Replies)
Discussion started by: nikhil jain
7 Replies

4. UNIX for Dummies Questions & Answers

emulating cat in sed with q option

Hi, I am aware that the below are the equivalent in sed for cat command. sed ':' sed -n 'p' Is there any way to emulate the same using "q" option in sed? Thanks (8 Replies)
Discussion started by: pandeesh
8 Replies

5. Shell Programming and Scripting

sed 'b' option

Hi, What does the following command do on files? sed '1b; $d' To me it just deletes the last line of the file. If so what is the significance of sed's 'b' option? Thanks (1 Reply)
Discussion started by: royalibrahim
1 Replies

6. Shell Programming and Scripting

sed delete option

I have tried doing this to delete some lines: sed '1,10d' file Now I want to specify a variable as a line number for example: lastline=wc -l file linestart=$lastline - 20 sed '$linestart,$lastlined' file but this will give error: sed: -e expression #1, char 3: extra characters after... (4 Replies)
Discussion started by: zorrox
4 Replies

7. Shell Programming and Scripting

Help needed sed: illegal option -- i

hello. i have a script, but in solaris i get this message sed: illegal option -- i whats wrong? With Ubuntu there is no problem. Thanks for help. #!/bin/bash for file in $(find /directory..../Test/*.txt -type f) do head -n 1 $file | egrep '^#!' if then sed -i '2i\Headertext'... (3 Replies)
Discussion started by: fertchen
3 Replies

8. Shell Programming and Scripting

sed insert option(-i) in shell script

Hi, Please tell me how to use insert option of sed in a shell script on Solaris/AIX plateform. For example I need to insert few lines on top of every file whose name starts with say "SOL_DEL". Thanx. (2 Replies)
Discussion started by: sanjay1979
2 Replies

9. Shell Programming and Scripting

Env Variable substituion in Sed (-s option)

Folks, I've been trying to use the ENV variable with slashes(/) in its value inside the sed substitution.. Sed 's/myval/'$MYVAL'/' file1 >> file.tmp If MYVAL=<sometext>, it works. if MYVAL=/home/venkat, it doesnt. *************************** bash-2.05$ export VAL=/home/venkat... (5 Replies)
Discussion started by: gvsreddy_539
5 Replies

10. UNIX for Dummies Questions & Answers

sed option to delete two words within a file

Could someone please help me with the following. I'm trying to figure out how to delete two words within a specific file using sed. The two words are directory and named. I have tried the following: sed '//d' sedfile sed '//d' sedfile both of these options do not work..... ... (4 Replies)
Discussion started by: klannon
4 Replies
Login or Register to Ask a Question