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

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(Tips)
(Tips)
Line 22: Line 22:
  
  
* 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
 +
</source>
 +
 +
 +
* To check if multiple files exist:
 +
<source lang=bash>
 +
files=$(ls /tmp/*.cache)
 +
if [ $files ]
 +
then
 +
echo "Cache files exist: do something with them"
 +
else
 +
echo "No cache files..."
 
fi
 
fi
 
</source>
 
</source>

Revision as of 15:02, 18 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


  • To check if multiple files exist:
files=$(ls /tmp/*.cache)
if [ $files ]
then
echo "Cache files exist: do something with them"
else
echo "No cache files..."
fi