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sumanch 02-18-2010 03:25 AM
merging two command in one command
 
Hi ,
I have a file and it has some content . Now I want to check for some text
in that file and if does not exist I want to append it . So I need to first grep and then do "echo "content" >> s.txt" . Is there any way to execute this two commands in a single command . Please let me know .

regards
Suman

druuna 02-18-2010 03:31 AM
Hi,

I'm sure that is possible (awk comes to mind), but why the need for one command, it would complicate things (just my 2c).

This grep something file || echo "text" >> file will do what you want. Short and elegant.

The || is an OR statement, if grep doesn't find anything ("fails" if you want) the echo statement is executed. There is also the && (AND) command (do something if previous command is successful).

Hope this helps.

Tinkster 02-18-2010 03:32 AM
Like in

Code:
grep -v "some text" s.txt && echo "some text" >> s.txt
?


P.S.: too slow ;D

evo2 02-18-2010 03:34 AM
Do you mean something like:
Code:
grep -q content s.txt || echo content >> s.txt
This should append "content" to the file s.txt if it is not there already.

Evo2.

PS. Much too slow!


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