fg

If job control is enabled (see the description of set -m ), the fg utility shall move a background job from the current environment (see Shell Execution Environment ) into the foreground. Using fg to place a job into the foreground shall remove its process ID from the list of those "known in the current shell execution environment''; see Asynchronous Lists . Provide a default value for the internationalization variables that are unset or null. (See XBD Internationalization Variables for the precedence of internationalization variables used to determine the values of locale categories.) If set to a non-empty string value, override the values of all the other internationalization variables. Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard error. [XSI) ] ![[Option Start]]( Determine the location of message catalogs for the processing of LC MESSAGES. ![[Option End]]( The extensions to the shell specified in this volume of POSIX.1-2017 have mostly been based on features provided by the KornShell. The job control features provided by bg , fg , and jobs are also based on the KornShell. The standard developers examined the characteristics of the C shell versions of these utilities and found that differences exist. Despite widespread use of the C shell, the KornShell versions were selected for this volume of POSIX.1-2017 to maintain a degree of uniformity with the rest of the KornShell features selected (such as the very popular command line editing features). This utility is marked as part of the User Portability Utilities option. The JC marking is removed from the SYNOPSIS since job control is mandatory is this version.