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Old 12-07-2009, 04:02 PM   #1
allenms
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Need some help with scripting in BASH


Need to write a small script that takes a colon-seperated list of items and outputs the items, one per line to standard output without the colons. Thanks,

Al
 
Old 12-07-2009, 04:03 PM   #2
GrapefruiTgirl
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Hi, welcome to LQ!

You need the `sed` command. It will work perfectly for that task.

Sasha
 
Old 12-07-2009, 04:10 PM   #3
allenms
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Sasha, appreciate the info but linux is pretty much "greek" to me. Can you give me an example? Just a script that read a small file, and removes the colons : and writes to a second file. Been trying to use the "cut" command but no luck. Thanks,
Al
 
Old 12-07-2009, 04:12 PM   #4
gerryd
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a sed or awk script would probably be better suited for this task.
 
Old 12-07-2009, 04:18 PM   #5
gerryd
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check this link out. you can use sed to find and replace characters. http://www.brunolinux.com/02-The_Ter..._with_Sed.html
 
Old 12-07-2009, 04:28 PM   #6
allenms
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Thanks for the link. Will try to get a handle on this in the AM as it's late on this side of the globe and the old melon needs a rest.

Al
 
Old 12-07-2009, 05:51 PM   #7
GrapefruiTgirl
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A *very* basic example, to just remove the colons from a file, and put the file back where it was, leaving a backup of the orioginal:
Code:
shell$ sed -i.BAK 's/://g' filename
NOTE: very simple -- but to see other ways of doing this, and other things sed can do, check the man page with:
Code:
shell$ man sed

And, if you need more help, just ask!
Sasha
 
Old 12-07-2009, 08:11 PM   #8
mehorter
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Code:
sed 's/:/\n/g' filename
This should do what you want.

sed --- calls the sed program.
' --- wrap "code" in single quotes.
s --- substitute command
: --- any ":" matches.
\n --- replace matching ":" with "\n" which is a "new-line" character.
g --- do the command globally; that is, at every occurrence on line.
" filename" ---space then filename.

If this works for you as evidenced by what rolls across your screen then simply redirect your output from the screen to a file like this:

Code:
sed 's/:/\n/g' filename > new_filename
choose a new filename or you will clobber the old one and end up with a zero-byte file or use the -i option, as mentioned above.
 
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Old 12-07-2009, 09:16 PM   #9
alienDog
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sed will work, but you can also do:

Code:
IFS=":"
for ITEM in $@; do
  echo $ITEM
done
unset IFS

Last edited by alienDog; 12-07-2009 at 09:19 PM.
 
  


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