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sed and awk to insert a line after a para

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Top Forums Shell Programming and Scripting sed and awk to insert a line after a para
# 8  
Old 05-12-2014
Quote:
Originally Posted by MadeInGermany
Probably you understand, if it becomes more explicit
Code:
( add==1 && /[)];/ ) { ... }

or
Code:
{ if ( add==1 && /[)];/ ) { ... }
}

NB && means AND
If i understand, the AND && is an logical and then 1 && 1=1 (1 && 0=0)
This User Gave Thanks to protocomm For This Post:
kshitij
# 9  
Old 05-12-2014
Here is a version of the script with comments:
Code:
awk '
$1 ~ /^mod[12]$/ {
	# If the 1st field on a line is "mod1" or "mod2", note that we need to
	# add text to the next line containing ");".
	add = 1
}
add && /[)];/ {
	# If add is not zero and is not the empty string, and the current line
	# contains ");", add in the desired text and clear add.
	sub(/[)];/, ",ak(kk) , akjj(ll) , aa(99k) );")
	add = 0
}
1	# Print the (possibly modified) input line.  ("{print $0}" is the
	# default action when no explicit action is specified.)
' file

These 2 Users Gave Thanks to Don Cragun For This Post:
kshitij protocomm
# 10  
Old 05-13-2014
Wrench equivalent sed command
Thank you all !
Its working ! but is it possible to provide equivalent sed command
since I need to write to the same file with -i option of sed
I dont think with awk we can write to the same file
# 11  
Old 05-13-2014
Quote:
Originally Posted by kshitij
Thank you all !
Its working ! but is it possible to provide equivalent sed command
since I need to write to the same file with -i option of sed
I dont think with awk we can write to the same file
Redirect the output of awk to a temp file and then copy the temp file to the original file.
# 12  
Old 05-13-2014
Quote:
Originally Posted by kshitij
Thank you all !
Its working ! but is it possible to provide equivalent sed command
since I need to write to the same file with -i option of sed
I dont think with awk we can write to the same file
Using:
Code:
sed -i.backup 'sed_commands' filename

is (as chacko193 said) roughly equivalent to:
Code:
cp filename filename.backup && \
awk 'awk_commands' filename.backup > filename

if you can rewrite the simple awk script we provided into a script using sed commands to get the same results.

On the other hand:
Code:
sed -i 'sed_commands' filename

is a disaster waiting to happen. (An I/O error, lack of disk space, power failure, etc. will result in loss of data.)
# 13  
Old 05-13-2014
an other solution:

Code:
var=$(command awk < file);echo "$var" > file

# 14  
Old 05-13-2014
Quote:
Originally Posted by protocomm
an other solution:

Code:
var=$(command awk < file);echo "$var" > file

Try that on a 100GB file...
This User Gave Thanks to MadeInGermany For This Post:
protocomm
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