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Top Forums UNIX for Dummies Questions & Answers Removing Double Spaces for cut command Post 302198235 by mikem22 on Thursday 22nd of May 2008 11:22:29 AM
Old 05-22-2008
Removing Double Spaces for cut command

Hi

I have a shell script that looks for running processes in order to kill them. The script (ksh) gets the PID of these processes using the following:

Code:
PROCS=`ps -fu ${USERID} | egrep "MONITOR" | grep -v grep | cut -d" " -f4`

However, I spotted an issue where PID's of different lengths would cause the logic to fail (since the ps -fu command aligns columns.. therefore there is sometimes a double space between the UID and PID columns (issue a ps -fu $USER to see this)

So, I thought using sed to globally replace the double space with a single would be the way to go....

Code:
PROCS=`ps -fu ${USERID} | egrep "MONITOR" | grep -v grep | sed -e "s/  / /g" | cut -d" " -f3`

This returns the PID fine for instances where there is a double or single space between the UID and PID coulmns of the ps -fu command but fails if there are 3 or more spaces. I guess the sed pattern matching doesn't cope with instances like this (where, say 4 spaces should be replaced with a single one).

Any ideas on how to get around this problem using either the above as a starting point, or maybe an alternative approach?

Thanks in advance.

Mike

Last edited by Yogesh Sawant; 05-22-2008 at 12:43 PM.. Reason: added code tags
 

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exit(1)                                                            User Commands                                                           exit(1)

NAME
exit, return, goto - shell built-in functions to enable the execution of the shell to advance beyond its sequence of steps SYNOPSIS
sh exit [n] return [n] csh exit [ ( expr )] goto label ksh *exit [n] *return [n] DESCRIPTION
sh exit will cause the calling shell or shell script to exit with the exit status specified by n. If n is omitted the exit status is that of the last command executed (an EOF will also cause the shell to exit.) return causes a function to exit with the return value specified by n. If n is omitted, the return status is that of the last command exe- cuted. csh exit will cause the calling shell or shell script to exit, either with the value of the status variable or with the value specified by the expression expr. The goto built-in uses a specified label as a search string amongst commands. The shell rewinds its input as much as possible and searches for a line of the form label: possibly preceded by space or tab characters. Execution continues after the indicated line. It is an error to jump to a label that occurs between a while or for built-in command and its corresponding end. ksh exit will cause the calling shell or shell script to exit with the exit status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the exit status is that of the last command executed. When exit occurs when executing a trap, the last command refers to the command that executed before the trap was invoked. An end-of-file will also cause the shell to exit except for a shell which has the ignoreeof option (See set below) turned on. return causes a shell function or '.' script to return to the invoking script with the return status specified by n. The value will be the least significant 8 bits of the specified status. If n is omitted then the return status is that of the last command executed. If return is invoked while not in a function or a '.' script, then it is the same as an exit. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
break(1), csh(1), ksh(1), sh(1), attributes(5) SunOS 5.10 15 Apr 1994 exit(1)
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