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Linux in a Nutshell, Fourth Edition
book

Linux in a Nutshell, Fourth Edition

by Ellen Siever, Stephen Figgins, Aaron Weber
June 2003
Beginner to intermediate content levelBeginner to intermediate
944 pages
43h 1m
English
O'Reilly Media, Inc.
Content preview from Linux in a Nutshell, Fourth Edition

Name

test

Synopsis

                  test 
                  condition
                  [ 
                  condition 
                  ]
               

Evaluate a condition and, if its value is true, return a zero exit status; otherwise, return a nonzero exit status. An alternate form of the command uses [ ] rather than the word test. condition is constructed using the following expressions. Conditions are true if the description holds true.

File conditions

-a file

file exists.

-b file

file is a block special file.

-c file

file is a character special file.

-d file

file is a directory.

-e file

file exists.

-f file

file is a regular file.

-g file

file has the set-group-ID bit set.

-h file

file is a symbolic link.

-k file

file has its sticky bit (no longer used) set.

-p file

file is a named pipe (FIFO).

-r file

file is readable.

-s file

file has a size greater than 0.

-t [n]

The open file descriptor n is associated with a terminal device (default n is 1).

-u file

file has its set-user-ID bit set.

-w file

file is writable.

-x file

file is executable.

-G file

file’s group is the process’s effective group ID.

-L file

file is a symbolic link.

-N file

file has been modified since its last time of access.

-O file

file’s owner is the process’s effective user ID.

-S file

file is a socket.

f1 -ef f2

Files f1 and f2 are linked (refer to the same file through a hard link).

f1 -nt f2

File f1 is newer than f2.

f1 -ot f2

File f1 is older than f2.

String conditions

-n s1

String s1 has nonzero length.

-o s1

Shell option s1 is set. Shell options are described under the set built-in command. ...

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Publisher Resources

ISBN: 0596004826