| envsubst - substitutes environment variables in shell format strings |
| envsubst [OPTION] [SHELL-FORMAT] |
| 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. |
| 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. |
| Written by Bruno Haible. |
| Report bugs to <bug-gnu-gettext@gnu.org>. |
|
Copyright 2003 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| The full documentation for envsubst is maintained as a Texinfo manual. If the info and envsubst programs are properly installed at your site, the command |
| info envsubst |
| should give you access to the complete manual. |