Difference between revisions of "User:Minooz/RepoSyncProj/Bash"

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(Tips)
(Tips)
 
(3 intermediate revisions by the same user not shown)
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* to check if a file exists: (when using wild cards, if you don't use double quotes, there will be this error: "binary operator expected")
+
* to check if a file exists:  
 
<source lang=bash>
 
<source lang=bash>
  
if [ -f "*.patch" ]; then
+
if [ -f m.patch ]; then
 
rm *.patch
 
rm *.patch
 
fi
 
fi
 
</source>
 
</source>
 +
 +
 +
* To check if multiple files exist:http://www.ducea.com/2009/03/05/bash-tips-if-e-wildcard-file-check-too-many-arguments/
 +
<source lang=bash>
 +
errors=$(ls Error*.txt 2> /dev/null | wc -l)
 +
if [ "$errors" != "0" ]; then
 +
rm Error*.txt
 +
fi
 +
</source>
 +
:Also this solution @ http://kenfallon.com/?p=4

Latest revision as of 15:27, 19 October 2010

Bash Scripting Help

Tutorial
Shell Programming
Linux org

Tips

  • Watch the spaces
if [ -d "$tmpInternal" ]; then
	rm -r $tmpInternal >> $dateError.txt 
elif [ -d "$tmpExternal" ]; then
	rm -r $tmExternal >> $dateError.txt 
fi


  • The increment operator in bash
while [ $revTmpInternal -lt $revInternal ]; do
	((revTmpInternal++))
done


  • to check if a file exists:
if [ -f m.patch ]; then
	rm *.patch
fi


errors=$(ls Error*.txt 2> /dev/null | wc -l)
if [ "$errors" != "0" ]; then
	rm Error*.txt
fi
Also this solution @ http://kenfallon.com/?p=4