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Full Discussion: SED - Match a line from a File
Top Forums Shell Programming and Scripting SED - Match a line from a File Post 302425282 by durden_tyler on Thursday 27th of May 2010 02:27:30 PM
Old 05-27-2010
Quote:
Originally Posted by angshuman_ag
...
Why I need this is so that I can delete the matching line from the file. Or I should be able to replace it with a BLANK.

I saw that if I use option "d" in sed command, it echos all the lines except the given one.

Code:
`sed -n '\/usr\/bin\/7897.xcf/d' file.txt 2>&1`

So, if there is a variable, can I do the same thing with sed ? It will be lot more easier.
...
Here's a Perl solution:

Code:
$
$
$ # display the content of the data file
$ cat -n file.txt
     1  /usr/bin/1234.xcf
     2  /usr/bin/3456.xcf
     3  /usr/bin/7897.xcf
     4  /usr/bin/2345.xcf
$
$ FILE="/usr/bin/7897.xcf"
$
$ # replace the line matching pattern $FILE with a blank space
$ # a backup file is created here
$
$ perl -i.bak -pne "s|^$FILE$| |" file.txt
$
$ # verify the update
$
$ cat -n file.txt
     1  /usr/bin/1234.xcf
     2  /usr/bin/3456.xcf
     3
     4  /usr/bin/2345.xcf
$
$

tyler_durden
 

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LEARN ABOUT SUNOS

getusershell

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/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/pfcsh
       /usr/bin/pfksh		  /usr/bin/pfsh
       /usr/bin/sh		  /usr/bin/tcsh
       /usr/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.

SunOS 5.10							    30 Aug 2004 						  getusershell(3C)
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