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How to pre-append a variable string to each line in a file?

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# 1  
Old 12-29-2013
How to pre-append a variable string to each line in a file?
How to pre-append a variable string to each line in a file contains both single and double quotes?

The variable string has no quotes in it.

thank you very much.

Smilie
Last edited by dtdt; 12-29-2013 at 12:02 PM..
# 2  
Old 12-29-2013
Quote:
Originally Posted by dtdt
which contains both single and double quotes in shell script?

thank you very much.

Smilie

Show us your input and expected output. we can't guess your "which contains" Smilie
# 3  
Old 12-29-2013
the original file contain quotes, not the pre-append variable string.

ty
------------------------
the acutal problem is: I have a set of files, file_a, file_b... file_xx, all those files have quotes inside somewhere

I need to pre-append a string

Axyz for all lines in file_a
Bcde for all lines in file_b
...
X-no-pattern-variable for all lines in file_xx
Last edited by dtdt; 12-29-2013 at 12:38 PM..
# 4  
Old 12-29-2013
Try something like:
Code:
awk 'FNR==1{f=FILENAME; sub(/.*_/,x,f); p=toupper(f f f)}{print p $0}' file_*

or to separate files:
Code:
awk 'FNR==1{f=FILENAME; t=f ".new"; sub(/.*_/,x,f); p=toupper(f f f)}{print p $0>t}' file_*

# 5  
Old 12-29-2013
i use a loop to bring in the pre-append variable

Quote:
Originally Posted by Scrutinizer
Try something like:
Code:
awk 'FNR==1{f=FILENAME; sub(/.*_/,x,f); p=toupper(f f f)}{print p $0}' file_*

or to separate files:
Code:
awk 'FNR==1{f=FILENAME; t=f ".new"; sub(/.*_/,x,f); p=toupper(f f f)}{print p $0>t}' file_*

# 6  
Old 12-29-2013
Me too (it is implicit in awk), I guessed it would be the last part of the filename. If that is not the case, could you show us your loop?
# 7  
Old 12-29-2013
i built a text file with pre-append string, and file name as:

Code:
axxdfd, f1
bxdfsdffdsfsdfs, f2
....
xxxdfsfs, f3

Code:
cat flist.txt | while read line; do
   pretext=`echo $line | cut -d',' -f1`
   filen=`echo  $line | cut -d',' -f2`

   #do the work
   #append each line in the file
done

Last edited by Scrutinizer; 12-29-2013 at 01:22 PM.. Reason: code tags
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