|BG(1P)||POSIX Programmer's Manual||BG(1P)|
Using bg to place a job into the background shall cause its process ID to become ``known in the current shell execution environment'', as if it had been started as an asynchronous list; see Section 18.104.22.168, Examples.
- Specify the job to be resumed as a background job. If no job_id operand is given, the most recently suspended job shall be used. The format of job_id is described in the Base Definitions volume of POSIX.1‐2008, Section 3.204, Job Control Job ID.
- Provide a default value for the internationalization variables that are unset or null. (See the Base Definitions volume of POSIX.1‐2008, Section 8.2, 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 for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to multi-byte characters in arguments).
Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard error.
- Determine the location of message catalogs for the processing of LC_MESSAGES.
"[%d] %s\n", <job-number>, <command>
where the fields are as follows:
- A number that can be used to identify the job to the wait, fg, and kill utilities. Using these utilities, the job can be identified by prefixing the job number with '%'.
- The associated command that was given to the shell.
- Successful completion.
- An error occurred.
The following sections are informative.
A background job can be stopped with the command:
kill −s stop job ID
The bg utility does not work as expected when it is operating in its own utility execution environment because that environment has no suspended jobs. In the following examples:
... | xargs bg (bg)
each bg operates in a different environment and does not share its parent shell's understanding of jobs. For this reason, bg is generally implemented as a shell regular built-in.
The bg utility is expected to wrap its output if the output exceeds the number of display columns.
The Base Definitions volume of POSIX.1‐2008, Section 3.204, Job Control Job ID, Chapter 8, Environment Variables, Chapter 11, General Terminal Interface
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|2013||IEEE/The Open Group|