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Old 11-02-2008, 07:09 AM   #1
C's Brother
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Registered: Aug 2008
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chopping away unwanted parts in string

Hi masters,

I am learning some bash programming; and it's not going too well, I'm afraid... :-(
I try to get the hang of "chopping off" unwanted information.

The problem is this output of the du command:
1. I want to get rid of the "./" at the beginning of ./export/home/john/Documents/BOOKS/DNS/books/ldap/ch13
2. How to get rid of the /export/home part of the total string.
3. How to get rid of the total sum the "du" command leaves behind at the end of the first column.

72 ./export/home/john/Documents/BOOKS/DNS/books/ldap/ch13
72 ./export/home/john/Documents/BOOKS/DNS/books/ldap/ch4
166 ./export/home/john/Documents/BOOKS/DNS/books/ldap/ch14
94 ./export/home/john/Documents/BOOKS/DNS/books/ldap/ch9
213 ./export/home/john/Documents/BOOKS/DNS/books/ldap/ch3
126 ./export/home/john/Documents/BOOKS/DNS/books/ldap/apd
72 ./export/home/john/Documents/BOOKS/DNS/books/ldap/ch7
72 ./export/home/john/Documents/BOOKS/DNS/books/ldap/ch10
1568 ./export/home/john/Documents/BOOKS/DNS/books/ldap/apc
706 ./export/home/john/Documents/BOOKS/DNS/books/ldap/apa
151 ./export/home/john/Documents/BOOKS/DNS/books/ldap/ch2
72 ./export/home/john/Documents/BOOKS/DNS/books/ldap/ch15
155 ./export/home/john/Documents/BOOKS/DNS/books/ldap/ch8
723 ./export/home/john/Documents/BOOKS/DNS/books/ldap/ch5
94 ./export/home/john/Documents/BOOKS/DNS/books/ldap/ch12

Thanks alot!

Cheers, C's brother
Old 11-02-2008, 07:22 AM   #2
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What have you tried so far?

The examples you give can be easily done with SED. For example, to delete a specific phrase---eg "/export/home", you would do this:

sed 's%/export/home%%' <filename >newfilename

This uses the SED substitution command, with "%" as the delimiter. The general syntax is "s%old%new%". In this case, I chose "%" as the delimiter so there would not be a conflict with the "/" in the actual test. ("/" is the delimiter seen most often in the SED documentation.)

To remove the last line, you can use SED, CUT, and probably several others.

Best SED tutorial here:

Bash tutorials:
Old 11-02-2008, 07:34 AM   #3
C's Brother
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Originally Posted by pixellany View Post
What have you tried so far?

regexp in Vi, but I was looking for something automated.
Thanks for the SED hint.
Works great!

Old 11-02-2008, 07:56 AM   #4
Sergei Steshenko
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Look up "perl one-liner".


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