linux

Bash : Compound condition using && (AND) and || (OR) operators

Submitted by khairie on Mon, 06/21/2010 - 17:47
Related Terms :
To have compound conditions in bash using && or ||:- 
if [ $VAR1 -eq 1 ] && [ "$VAR2" == "true" ]
then
    # do something
fi
 
if [ "$VAR1" == "String 1" ] || [ "$VAR2" == "String 2" ]
then
    # do something
fi

Reference: http://www.museum.state.il.us/ismdepts/library/linuxguides/abs-guide/ops.html#ANDOR

Bash : Compare Strings With Spaces

Submitted by khairie on Tue, 06/15/2010 - 13:01
Related Terms :

To compare two strings that contain spaces in bash, enclose them with a double quote (e.g.  "$VAR" ). Example below:-

if [ "$VAR" == "this is a string with spaces" ]
then
    # do something
fi

Reference: http://hacktux.com/bash/string

Exclude files/directories when using linux tar command

Submitted by khairie on Tue, 03/02/2010 - 01:06
Related Terms :

To exclude files/folders when archiving using tar in linux, use the following command:-

tar -czvf filename.tar.gz --exclude 'path1/*' --exclude 'path2/*' --exclude 'path3/*' folder_or_files_to_be_archived

References:-
http://www.wallpaperama.com/forums/how-to-exclude-a-directory-in-a-tar-l...
http://www.cyberciti.biz/faq/exclude-certain-files-when-creating-a-tarba...
http://www.linuxtopia.org/online_books/linux_tool_guides/tar_user_guide/...

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