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 GID.-
-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 UID.-
-S
file
file
is a socket.-
f1
-ef
f2
Files
f1
andf2
are linked (refer to the same file through a hard link).-
f1
-nt
f2
File
f1
is newer thanf2
.-
f1
-ot
f2
File
f1
is older thanf2
.
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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