What's wrong my sed? Post: 302668029

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Top Forums Shell Programming and Scripting What's wrong my sed? Post 302668029 by alister on Sunday 8th of July 2012 12:02:46 PM

07-08-2012

Registered User

Quote:

Originally Posted by yanglei_fage

Code:

$ cat ./xx.sh 
#!/bin/bash
while read line
do
    sed -n '/${line}/p' ./file2
done < ./file1

You did not show the desired output for the sample data, so I'm assuming that your goal is to print out each line in file2 that contains a line in file1 as a substring.

Code:

grep -Ff file1 file2

Regards,
Alister

---------- Post updated at 12:02 PM ---------- Previous update was at 11:58 AM ----------

Quote:

Originally Posted by yanglei_fage

"The sed command will not work because of the / delimiter"
if I change the sed to " sed -i '%${line}%d' file2" it still get error
sed: -e expression #1, char 1: unknown command: `%'

To use a different delimiter for an address, the opening delimiter must be backslash-escaped (this is not necessary when using a different delimiter to delimit the components of a substitute, s, command).

However, any sed solution will treat literal text as a regular expression. That is a very poor approach. Each . in file1 will match any character at all. Each * will allow the preceding character to occur an arbitrary number of times, or to not occur at all. And so it goes with all regular expression metacharacters.

Regards,
Alister

Last edited by alister; 07-08-2012 at 01:22 PM..

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colorgcc

COLORGCC(1)						      General Commands Manual						       COLORGCC(1)

NAME

       colorgcc - colorization wrapper for gcc

SYNOPSIS

       colorgcc [OPTION]...  [FILENAME]...

DESCRIPTION

       colorgcc acts as a wrapper around gcc(1) to ease reading its output by colorizing it.

OPTIONS

       Since colorgcc is a wrapper around gcc(1), it has the same command line options as gcc(1).

USAGE

       At  your shell prompt, set your CC environment variable to 'colorgcc'.  This may be done in several different ways, depending on what shell
       you use.

       In a Bourne-compatible shell (bash, ash, zsh, pdksh), type:
       export CC="colorgcc"

       In a C shell variant (csh, tcsh), type:
       setenv CC "colorgcc"

       Refer to your shell's documentation for more information on setting environment variables.

FILES

       /etc/colorgcc/colorgccrc
	      System-wide configuration file for colorgccrc.

       $HOME/.colorgccrc
	      Personal configuration file for colorgccrc.

SEE ALSO

       gcc(1), colorgccrc(5)

HISTORY

       Jan 15 2003: Initial version of this manual-page.

REPORTING BUGS

       Report bugs to <jmoyers@geeks.com>

AUTHORS

       Jamie Moyers <jmoyers@geeks.com> is the author of colorgcc.

       This manual page was written by Joe Wreschnig <piman@sacredchao.net>, and modified by David  Weinehall  <tao@debian.org>,  for  the  Debian
       GNU/Linux system (but may be used by others).

COPYRIGHT

       Copyright (C) 2003 Jamie Moyers
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

								   Jan 15, 2003 						       COLORGCC(1)