1ENVSUBST(1)                      User Commands                     ENVSUBST(1)
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NAME

6       envsubst - substitutes environment variables in shell format strings
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SYNOPSIS

9       envsubst [OPTION] [SHELL-FORMAT]
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DESCRIPTION

12       Substitutes the values of environment variables.
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14   Operation mode:
15       -v, --variables
16              output the variables occurring in SHELL-FORMAT
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18   Informative output:
19       -h, --help
20              display this help and exit
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22       -V, --version
23              output version information and exit
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25       In  normal operation mode, standard input is copied to standard output,
26       with references to environment  variables  of  the  form  $VARIABLE  or
27       ${VARIABLE}  being  replaced  with  the  corresponding  values.   If  a
28       SHELL-FORMAT is given, only those environment variables that are refer‐
29       enced  in SHELL-FORMAT are substituted; otherwise all environment vari‐
30       ables references occurring in standard input are substituted.
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32       When --variables is used, standard input is  ignored,  and  the  output
33       consists of the environment variables that are referenced in SHELL-FOR‐
34       MAT, one per line.
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AUTHOR

37       Written by Bruno Haible.
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REPORTING BUGS

40       Report    bugs    in    the    bug    tracker    at     <https://savan‐
41       nah.gnu.org/projects/gettext> or by email to <bug-gettext@gnu.org>.
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44       Copyright  ©  2003-2020 Free Software Foundation, Inc.  License GPLv3+:
45       GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>
46       This is free software: you are free  to  change  and  redistribute  it.
47       There is NO WARRANTY, to the extent permitted by law.
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SEE ALSO

50       The  full documentation for envsubst is maintained as a Texinfo manual.
51       If the info and envsubst programs are properly installed at your  site,
52       the command
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54              info envsubst
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56       should give you access to the complete manual.
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60GNU gettext-runtime 20200704       July 2020                       ENVSUBST(1)
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