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15.5.2.5 Invoking the ‘envsubst’ program
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envsubst [OPTION] [SHELL-FORMAT]
The ‘envsubst’ program substitutes the values of environment
variables.
*Operation mode*
‘-v’
‘--variables’
Output the variables occurring in SHELL-FORMAT.
*Informative output*
‘-h’
‘--help’
Display this help and exit.
‘-V’
‘--version’
Output version information and exit.
In normal operation mode, standard input is copied to standard
output, with references to environment variables of the form ‘$VARIABLE’
or ‘${VARIABLE}’ being replaced with the corresponding values. If a
SHELL-FORMAT is given, only those environment variables that are
referenced in SHELL-FORMAT are substituted; otherwise all environment
variables references occurring in standard input are substituted.
These substitutions are a subset of the substitutions that a shell
performs on unquoted and double-quoted strings. Other kinds of
substitutions done by a shell, such as ‘${VARIABLE-DEFAULT}’ or
‘$(COMMAND-LIST)’ or ‘`COMMAND-LIST`’, are not performed by the
‘envsubst’ program, due to security reasons.
When ‘--variables’ is used, standard input is ignored, and the output
consists of the environment variables that are referenced in
SHELL-FORMAT, one per line.
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2024-11-21 05:35 @18.218.190.118 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)