How to cat a file removing commented lines in Unix/Linux How to cat a file removing commented lines in Unix/Linux, cat file, remove commented lines
How to cat a file removing commented lines in Unix/Linux
Many configuration files meight have lots of commented lines that wouldn't be usefull in some situations. Here's how to remove commented lines from a file:
$ cat some.file #Commented line 1 Uncommented line 1 #commented line 2 Uncommented line 2 #Commented line 3 Uncommented line 3
The file some.file has 3 commented lines and 3 uncommented lines. (In this example # is the character that comments the line) and there is at least one command to remove commented lines.
1.
$ cat some.file | grep -v ^# Uncommented line 1 Uncommented line 2 Uncommented line 3
2.
$ grep -v ^# some.file Uncommented line 1 Uncommented line 2 Uncommented line 3
-v argument fro grep means
-v, --invert-match Invert the sense of matching, to select non-matching lines.
^# - means to match ( inverse match, -v ) the lines that start with the escaped () character #.
Note: Other configuration files meight have commented lines starting with ; , like php.ini configuration for php. Use google/yahoo to search for grep and regular expressions to have a larger idea.
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Copyright 2007 Andrei Manescu
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