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ENVSUBST(1) User Commands ENVSUBST(1) NAME envsubst - substitutes environment variables in shell format strings SYNOPSIS envsubst [OPTION] [SHELL-FORMAT] DESCRIPTION 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 con- sists of the environment variables that are referenced in SHELL-FORMAT, one per line. AUTHOR Written by Bruno Haible. REPORTING BUGS Report bugs in the bug tracker at <https://savannah.gnu.org/projects/get- text> or by email to <bug-gettext@gnu.org>. COPYRIGHT Copyright (C) 2003-2026 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO 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. GNU gettext-runtime 1.0 January 2026 ENVSUBST(1)
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