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File Attributes Comparison
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| #File Attributes Comparison are | |
| -a file : True if file exists. | |
| -b file : True if file exists and is a block special file. | |
| -c file : True if file exists and is a character special file. | |
| -d dir : True if file exists and is a directory. | |
| -e file : True if file exists. | |
| -f file : True if file exists and is a regular file. | |
| -g file : True if file exists and is set-group-id. | |
| -h file : True if file exists and is a symbolic link. | |
| -k file : True if file exists and its ‘‘sticky’’ bit is set. | |
| -p file : True if file exists and is a named pipe (FIFO). | |
| -r file : True if file exists and is readable. | |
| -s file : True if file exists and has a size greater than zero. | |
| -t fd : True if file descriptor fd is open and refers to a terminal. | |
| -u file : True if file exists and its set-user-id bit is set. | |
| -w file : True if file exists and is writable. | |
| -x file : True if file exists and is executable. | |
| -O file : True if file exists and is owned by the effective user id. | |
| -G file : True if file exists and is owned by the effective group id. | |
| -L file : True if file exists and is a symbolic link. | |
| -S file : True if file exists and is a socket. | |
| -N file : True if file exists and has been modified since it was last read. |
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