fg - Runs jobs in the foreground
The C shell has a built-in version of the fg command. If you are using the C shell, and want to guarantee that you are using the command described here, you must specify the full path /usr/bin/fg. See the csh(1) reference page for a description of the built-in command.
Interfaces documented on this reference page conform to industry standards as follows:
fg: XPG4, XPG4-UNIX
Refer to the
reference page for more information
about industry standards and associated tags.
Specifies the job to be run as a foreground job. If no
operand is given, the
for the job that was most recently suspended, placed in the background or
run as a background job is used. The format of
is described in the
section of the
If job control is enabled (see the description of set -m in the ksh(1) reference page), the fg utility moves a background job from the current environment into the foreground.
to place a job into the foreground removes
its process ID from the list of those ``known in the current shell execution
environment''; see the
section of the
If job control is disabled, the
exits with an error and no job is placed in the foreground.
utility does not work as expected
when it is operating in its own utility execution environment because that
environment has no applicable jobs to manipulate.
The following exit values are returned:
An error occurred.
The following environment variables affect the execution of
Provides a default value for the internationalization
variables that are unset or null. If
is unset or null, the corresponding value from the default locale is used.
If any of the internationalization variables contain an invalid setting, the
utility behaves as if none of the variables had been defined.
If set to a non-empty string value, overrides
the values of all the other internationalization variables.
Determines the locale for the interpretation
of sequences of bytes of text data as characters (for example, single-byte
as opposed to multibyte characters in arguments).
Determines the locale used to affect the
format and contents of diagnostic messages written to standard error.
Determines the location of message catalogues
for the processing of
Commands: bg(1), csh(1), jobs(1), kill(1), ksh(1), sh(1p), wait(1)