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assistance requested (sed related)

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# 1  
Old 02-02-2008
assistance requested (sed related)
I gotta write a command to change the accounts in /etc/passwd that use a shell other than the bash to bash shell. those accounts that dont use a shell shouldnt get modified. assuming all the shell programs end in sh and other programs dont. and the result should go into /etc/passwd.rev

any hint?
# 2  
Old 02-02-2008
Awk is a much less unsuitable tool for manipulating a paswd file than sed.

Also be aware that on many systems root's password is set to /sbin/sh and uses a statically compiles shell which should not be changed.

Code:
sed 's#:[^:][^:]*$#/bin/bash#' /etc/passwd

# 3  
Old 02-02-2008
Reborg,

You forget to place a colon before "/bin/bash" and it changes all lines and that's not what the OP wants.
A little fit of your the line:

Code:
sed '/.*sh$/s#:[^:][^:]*$#:/bin/bash#' /etc/passwd

A solution with awk should looks like:

Code:
awk 'BEGIN{FS=OFS=":"}$7 ~ /.*sh$/{$7="/bin/bash"}1' /etc/passwd

Regards
# 4  
Old 02-05-2008
tnx a lot,
now what if I want to limit my sed further more so that it only looks for the lines that have 144 or 275 somewhere in them?
this is what I have:
sed '/.*144.*sh$/s#:[^:][^:]*$#:/bin/bash#' /etc/passwd
how can I include both 144 and 275 before the ".*"?
tnx again
# 5  
Old 02-05-2008
Quote:
Originally Posted by metalwarrior
tnx a lot,
now what if I want to limit my sed further more so that it only looks for the lines that have 144 or 275 somewhere in them?
this is what I have:
sed '/.*144.*sh$/s#:[^:][^:]*$#:/bin/bash#' /etc/passwd
how can I include both 144 and 275 before the ".*"?
tnx again
This post looks very similiar to this one - https://www.unix.com/unix-dummies-que...#post302164089

metalwarrior, you are consistently breaking the rules by double-posting. Please refrain from doing so.
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