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Searching for a specific string in a file

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# 8  
Old 06-27-2011
Quote:
Originally Posted by methyl
It is hard to guess what you intended from faulty code. Please describe the condition in words.
Oh sorry, I thought it was clear from my 1st post that I was trying to search for multiple strings (of which one was defined ..$D)!!


Quote:
Originally Posted by agama
Second, your variables won't expand inside of single quotes. Put both patterns into one set of double quotes.
Dint know this one, Thank you!


Quote:
Originally Posted by agama
Finally, you shouldn't put the command inside of brackets.
Can you explain why this is so?
# 9  
Old 06-27-2011
Quote:
Can you explain why this is so?
"if" waits a command, and "[" is just a command. Really this is a synonym for "test". When command executes it returns exit code. If exit code == 0 then "if" counts it as true condition and executes commands in its body.

When you write, for example
Code:
if [ -f 'some_file' ]; then ...

really you run the command:
Code:
if test -f 'some_file' ; then ...

In case of grep - this command returns 0 if it finds matches or non-0 if it's not. This is perfect condition for "if".

Excuse me if something is unclear. I'm working on my English.
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