Problem on understanding the regexp command Post: 302745027

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

egrep understanding problem

Hi, Can anyone please let me know the meaning of this line,i am not able to understand the egrep part(egrep '^{1,2}).This will search for this combination in beginning but what does the values in {}signifies here. /bin/echo $WhenToRun | egrep '^{1,2}:$' >/dev/null

2. Shell Programming and Scripting

Problem with regexp for IP-Adress Pattern

Hi all Unix Gurus! Since hours (even days :-)) I'm trying to find the correct pattern to search for IP addesses in text files. The pattern to find a IP address itself is not too difficult: '((||1{2}|2|2{2})\.){3,}(||1{2}|2|2{2})' BUT, of course the above pattern is also matching lines like...

3. UNIX for Dummies Questions & Answers

print the line immediately after a regexp; but regexp is a sentence

Good Day, Im new to scripting especially awk and sed. I just would like to ask help from you guys about a sed command that prints the line immediately after a regexp, but not the line containing the regexp. sed -n '/regexp/{n;p;}' filename What if my regexp is 3 word or a sentence. Im...

4. Shell Programming and Scripting

Regexp and sed problem

Basically it should identify what ever is in between /*< >*/ (tags) and replace dbname ending with (.) with the words in between the tags i.e. DELETE FROM /*<workDB>*/epd_test./*<multi>*//*<version>*/epd_tbl1 ALL; into DELETE FROM...

5. Shell Programming and Scripting

Problem with the shell script for understanding

Can Anybody please tell me the meaning of the script: #!/bin/sh str=$@ echo $str | sed 's/.*\\//' exit 0

6. UNIX for Dummies Questions & Answers

Problem understanding Paths

If I don't explain my issue well enough, I apologize ahead of time, extreme newbie here to scripting. I'm currently learning scripting from books and have moved on to the text Wicked Cool Shell Scripts by Dave Taylor, but there are still basic concepts that I'm having trouble understanding. ...

7. Shell Programming and Scripting

Problem in understanding export uses

i am beginner in shell scripting. not able to understand what below line will do. PS1=${HOST:=�uname -n�}"$ " ; export PS1 HOST below is the script #!/bin/hash PS1=${HOST:=�uname -n�}"$ " ; export PS1 HOST ; echo $PS1 and i getting the below output �uname -n�$

8. Shell Programming and Scripting

Regarding regexp command

Hello, I'm reviewing a tcl script, and for this line: regexp {(\S+)\/+$} $string match $catch if,$string == ab123c/de456f/try99/zxy is there any possibility that $catch == ab123c/de456f/try99 ? or it must only be $catch == ab123c/de456f/try99/zxy ? Please advise. Thanks

9. Shell Programming and Scripting

Problem in understanding debugging

Hi i was going through the script debugging technique. below example was given in the book. 1 #!/bin/sh 2 3 Failed() { 4 if ; then 5 echo "Failed. Exiting." ; exit 1 ; 6 fi 7 echo "Done." 8 } 9 10 echo "Deleting old backups,...

10. Shell Programming and Scripting

Problem with (Understanding) function

I have this code #!/bin/bash LZ () { RETVAL="\n$(date +%Y-%m-%d_%H-%M-%S) --- " return RETVAL } echo -e $LZ"Test" sleep 3 echo -e $LZ"Test" which I want to use to make logentrys on my NAS. I expect of this code that there would be output like 2017-03-07_11-00-00 --- Test

LEARN ABOUT DEBIAN

gchem3d

GCHEM3D(1)						       gnome-chemistry-utils							GCHEM3D(1)

NAME

       gchem3d - a small chemical viewer application

SYNOPSIS

       gchem3d [OPTION(S)...] [FILE...]

DESCRIPTION

       gchem3d is a small chemical viewer application, which can show several chemical file formats.

OPTIONS

       The following options are accepted:

       -b COLOR, --bgcolor=COLOR
	   Use the given color as background color.  COLOR can be one of "black" (default), "white", "#rrggbb" (don't forget to escape the "#"
	   character in the shell).

       -d MODEL, --display3d=MODEL
	   Choose how molecules are displayed.	MODEL can be one of "BallnStick" (default), "SpaceFill".

       -?, --help
	   Show application help options.

       --help-all, --help-*
	   Print all or just a group of help options. These options are not documented here. Instead see gtk-options(7) and gnome-options(7).

       -v, --version
	   Print gchem3d version information.

SEE ALSO

       gnome-options(7), gtk-options(7)

AUTHORS

       Jean Brefort <jean.brefort@normalesup.org>
	   Program author.

       Daniel Leidert <daniel.leidert@wgdd.de>
	   Manpage author.

COPYRIGHT

       Copyright (C) 2002-2007 Jean Brefort
       Copyright (C) 2004-2007 Daniel Leidert

       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or any
       later version published by the Free Software Foundation.

gcu 0.12				      $Date: 2009-03-19 10:53:47 +0100 (jeu. 19 mars 2009) $					GCHEM3D(1)