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Shell Programming and Scripting

Commenting a specific line and inserting a new line after commented line.

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Top Forums Shell Programming and Scripting Commenting a specific line and inserting a new line after commented line.
# 15  
Old 12-20-2012
Well the ^ means beginning of the line, so you could try something like this:
Code:
sed "s/^ *restoredb2...

is there are no TABs
# 16  
Old 12-21-2012
Quote:
Originally Posted by Scrutinizer
Well the ^ means beginning of the line, so you could try something like this:
Code:
sed "s/^ *restoredb2...

is there are no TABs
Thank you very much for your help.
This worked fine for spaces.

I have not been in situation to deal with TAB but it's a good idea to put a logic for TAB as well.

I tried following option to deal with tab and space at same time but no luck:
Code:
sed "s/^ *\t*restoredb2=.*/#&\\
restoredb2=$restoredb2_value   # $comment/" restore_$(basename $PWD).sh

and

Code:
sed "s/^ *\\t*restoredb2=.*/#&\\
restoredb2=$restoredb2_value   # $comment/" restore_$(basename $PWD).sh


Still it is reading SPACE but not TAB.

It would be great if you can help me in this as well.
# 17  
Old 12-21-2012
Some sed's understand \t, so then you can use:
Code:
s/^[ \t]*restoredb....

otherwise instead of \t you could enter and actual TAB character, using Ctrl-V - TAB
But I would use this:
Code:
sed 's/^[[:space:]]*restoredb...

This User Gave Thanks to Scrutinizer For This Post:
manishdivs
# 18  
Old 12-21-2012
\t did not work with my sed.


Following options ran successfully:
Code:
sed "s/^[      ]*restoredb2=.*/#&\\	# [] consists of one SPACE & one TAB character.
restoredb2=$restoredb2_value   # $comment/" restore_$(basename $PWD).sh

Code:
sed "s/^[[:space:]]*restoredb2=.*/#&\\
restoredb2=$restoredb2_value   # $comment/" restore_$(basename $PWD).sh

It would be really thankful if you can share the significance of [[:space:]] character.
# 19  
Old 12-21-2012
Quote:
Originally Posted by manishdivs
... ... ...

It would be really thankful if you can share the significance of [[:space:]] character.
The character class space contains the following characters in the POSIX and C locales: <space>, <tab>, <form-feed>, <carriage-return>, <newline>, and <vertical-tab>. For what you are doing here, I would tend to use the character class blank which only contains the <space> and <tab> characters rather than the character class space:
Code:
sed "s/^[[:blank:]]*restoredb2=.*/#&\\
restoredb2=$restoredb2_value   # $comment/" restore_$(basename $PWD).sh

This User Gave Thanks to Don Cragun For This Post:
manishdivs
# 20  
Old 12-21-2012
With awk, taking space into account wouldn't be needed because awk does this implicitly with the default field separator:
Code:
awk '$1~/^line=/{$0="# "$0 RS s}1' s="$restoreufs    # This comment line" file

Last edited by Scrutinizer; 12-21-2012 at 08:40 PM..
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