This is good to test a file has enough permission to do read, write or execute operations. For a good programmer, you should use these functions before doing any operations on the file.
1. Test read permission:
Below script will check if the given file has read permission for currently logged in user. This will be useful to test before start reading any file inside a shell script.
1 2 3 4 5 6 7 8 | #!/bin/bash if [ -r /tmp/myfile.txt ] then echo "File has read permission" else echo "You don't have read permission" fi |
2. Test write permission:
Below script will check if a given file has to write permission for currently logged in user. This will be useful to test before writing content to any file inside a shell script.
1 2 3 4 5 6 7 8 | #!/bin/bash if [ -w /tmp/myfile.txt ] then echo "File has write permission" else echo "You don't have write permission" fi |
3. Test execute permission:
Below script will check if the given file has execute permission for currently logged in user. This will be useful to test before executing any file inside a shell script.
1 2 3 4 5 6 7 8 | #!/bin/bash if [ -x /tmp/myfile.txt ] then echo "File has execute permission" else echo "You don't have execute permission" fi |
How did it make you feel?
Hey Rahul, found this very helpful. Thanks for keeping so brief and straight forward, its appreciated.