This is good to test a file has enough permission to do read, write or execute operation’s. For a good programmer you should use these functions before doing any operations on file.
1. Test if File has Read Permission:
Below script will check if given file has read permission for current logged in user. This will be useful to test before start reading any file inside shell script.
#!/bin/bash
if [ -r /tmp/myfile.txt ]
then
echo "File has read permission"
else
echo "You don't have read permission"
fi
2. Test if File has Write Permission:
Below script will check if given file has write permission for current logged in user. This will be useful to test before writing content to any file inside shell script.
#!/bin/bash
if [ -w /tmp/myfile.txt ]
then
echo "File has write permission"
else
echo "You don't have write permission"
fi
3. Test if File has Execute Permission:
Below script will check if given file has execute permission for current logged in user. This will be useful to test before executing any file inside shell script.
#!/bin/bash
if [ -x /tmp/myfile.txt ]
then
echo "File has execute permission"
else
echo "You don't have execute permission"
fi
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