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Full Discussion: Need help with how to search a file for a variable string and delete that line
Top Forums UNIX for Beginners Questions & Answers Need help with how to search a file for a variable string and delete that line Post 303031312 by Don Cragun on Monday 25th of February 2019 10:57:11 PM
Old 02-25-2019
Quote:
Originally Posted by newbie_01
Thanks Don, I feel so small looking at what's missing, I thought when I tried //, that's it so I change it to a # but never thought about the \.
Hi newbie_01,
There is no reason to feel small. We're all here to learn. Next time you'll remember what you need to do.

Unfortunately you didn't tell us what operating system you're using. With a ksh with a 1988 vintage from many UNIX systems (including the Solaris system we could now guess that you're using), you can't get process substitution (you need a ksh93 for that). This is why it is so important for you to tell us what operating system and shell (including version numbers) you're using each time you start a thread so we know which operating system and shell extensions have a chance of working in your environment.

Even without process substitution, one could use something like:
Code:
#!/bin/ksh
IAm=${0##*/}
TmpFile=$IAm.$$
trap 'rm -rf "$TmpFile"' 0

sed 's/:.*$//' list.err > "$TmpFile"
/usr/xpg4/bin/grep -vf "$TmpFile" list.all

It isn't a one-liner, but it just invokes grep once, sed once, and rm once at the end to remove the temporary file it creates.

This should work on both Solaris and Linux systems (but you'll need to remove the /usr/xpg4/bin/ on the Linux system).
This User Gave Thanks to Don Cragun For This Post:
newbie_01
 

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LEARN ABOUT OPENSOLARIS

setusershell

getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME

       getusershell, setusershell, endusershell - get legal user shells

SYNOPSIS

       #include <unistd.h>

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

DESCRIPTION

       The  getusershell()  function  returns  a  pointer  to  a  legal  user  shell  as defined by the system manager in the file /etc/shells. If
       /etc/shells does not exist, the following locations of the standard system shells are used in its place:

	 /bin/bash		    /bin/csh
	 /bin/jsh		    /bin/ksh
	 /bin/ksh93		    /bin/pfcsh
	 /bin/pfksh		    /bin/pfsh
	 /bin/sh		    /bin/tcsh
	 /bin/zsh		    /sbin/jsh
	 /sbin/pfsh		    /sbin/sh
	 /usr/bin/bash		    /usr/bin/csh
	 /usr/bin/jsh		    /usr/bin/ksh
	 /usr/bin/ksh93 	    /usr/bin/pfcsh
	 /usr/bin/pfksh 	    /usr/bin/pfsh
	 /usr/bin/sh		    /usr/bin/tcsh
	 /usr/bin/zsh		    /usr/sfw/bin/zsh
	 /usr/xpg4/bin/sh

       The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.

       The setusershell() function rewinds the file or the list.

       The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.

RETURN VALUES

       The getusershell() function returns a null pointer on EOF.

BUGS

       All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.

NOTES

       Restricted shells should not be listed in /etc/shells.

SunOS 5.11							    1 Nov 2007							  getusershell(3C)
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