Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

envsubst(1) [linux man page]

ENVSUBST(1)								GNU							       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 consists of the environment variables that are referenced in SHELL-FOR- MAT, one per line. AUTHOR
Written by Bruno Haible. REPORTING BUGS
Report bugs to <bug-gnu-gettext@gnu.org>. COPYRIGHT
Copyright (C) 2003-2007 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://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 0.18.1 June 2010 ENVSUBST(1)

Check Out this Related Man Page

ENVSUBST(1)								GNU							       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 consists of the environment variables that are referenced in SHELL-FOR- MAT, one per line. AUTHOR
Written by Bruno Haible. REPORTING BUGS
Report bugs to <bug-gnu-gettext@gnu.org>. COPYRIGHT
Copyright (C) 2003-2007 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://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 0.18.1 June 2010 ENVSUBST(1)
Man Page

15 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

echo $SHELL, $PWD and etc.

hi, this echo $SHELL will give the shell name.. how to get the other list of variables (besides SHELL) values? and also, different shells have different variable names (example SHELL) (10 Replies)
Discussion started by: yls177
10 Replies

2. Shell Programming and Scripting

Problem in assigning values to variables

Hi, I have some problem in assigning values to variables: This is what Iam literally doing: i=0 input=test temp$i = $input In the sense, I try to assign the value in the variable input (ie., test) to another variable temp0 (since i is assigned 0, temp$i is temp0). Seems simple, but I get... (3 Replies)
Discussion started by: mohanprabu
3 Replies

3. UNIX for Dummies Questions & Answers

help..Environment variables...

hi, 1). i would like to know what is meant by environment variables? 2). is the number of envi variables is a constant number for unix systems? 3). how to see the list of envi variables (and the values of the envi variables)in a single command? 4). if this questions were already asked... (3 Replies)
Discussion started by: sekar sundaram
3 Replies

4. Shell Programming and Scripting

Replace environment variables with sed

Hi, I need to write a sed that replaces the value of all environment variables that have PASS in the name with ***** . I have a log file who prints the value of all environment variables ,including those who hold passwords. In the name of these variables I found always the PASS string, ex:... (16 Replies)
Discussion started by: liorfe
16 Replies

5. Shell Programming and Scripting

how can i past environment variables?

i am asking to do somethings like: make use of 2 environment variables: ASS1_DATA_DIR specifies the location of the input data files ASS1_OUTPUT_DIR specifies the location of the output data files i have something like that; #set environment variables set VARIABLE1=ASS1_DATA_DIR... (5 Replies)
Discussion started by: mingming88
5 Replies

6. UNIX for Dummies Questions & Answers

how to expand environment variables in a file?

I am new to unix and would appreciate if someone could help. I have an environment variable SourceFilePath=/db1/Src/test set on the unix server. I want to expand this SHELL variable in a file using any command sed, awk etc File contents is as follows: var=$SourceFilePath/file.txt ... (2 Replies)
Discussion started by: debbie15
2 Replies

7. Shell Programming and Scripting

Help on Time elapsed?

Hi All, I have 2 variables like SDATE and EDATE. Now for example i ll give you values for the above 2 variables. SDATE=11/08/09 11:22 EDATE=11/09/09 22:33 the values of the above variables are represented like this>>>>>> mm/dd/yy hh:mm Now I want to evaluate total time elapsed... (3 Replies)
Discussion started by: smarty86
3 Replies

8. SCO

Help finding where certain environment variables are set

i have two machines that should be identical but on one system there are some oracle environment (ORACLE_SID, ORACLE_HOME, etc...) variables that are not being set for the users. I am trying to find where those environment variables are being set on the system which is working properly. All... (5 Replies)
Discussion started by: kuliksco
5 Replies

9. Shell Programming and Scripting

environment function?

We all know environment variables.But when I type "set" in bash shell, I found not only environment variables but also this: _alias () { local cur; COMPREPLY=(); cur=${COMP_WORDS}; case "$COMP_LINE" in *) COMPREPLY=($( compgen -A alias -S '=' -- $cur... (2 Replies)
Discussion started by: vistastar
2 Replies

10. Shell Programming and Scripting

Shell scripting for this sequence

KINDLY HELP ME FOR SHELL SCRIPTING FOR THIS TASK. My input file consists of thousands of sequence in this format. The given input file consists of four sequences which are starting with ‘>’ symbol (each sequence shown in different colour for easy understanding). I have to use a command at $... (3 Replies)
Discussion started by: kswapnadevi
3 Replies

11. Shell Programming and Scripting

Reading variables from a file

Hi, I have an issue that hope someone will be able to help me with.... I'm using a while-read loop to read lines from a file that contain variables, and I want the variables substituted, but I can't get it to work - the below example with explain: while read line do echo $line ... (5 Replies)
Discussion started by: AndyG
5 Replies

12. Homework & Coursework Questions

Refactoring via SHELL utilities

I am completely new to Shell scripting and I have almost no idea what I'm doing here. I'm not a stranger at all to programming, but the way SHELL is done drives me to insanity. Here's my current issue: 1. We are to create a BASH script called rafactor.sh This program takes in two (or three)... (6 Replies)
Discussion started by: Okysho
6 Replies

13. Shell Programming and Scripting

Compare and calculate two variables

Hi, I have two variables with some values with 5 decimal digits and separated with space, the values of the variables are different, I want to make operations with this two variables. The way was I find to do it itīs with files and paste file1 file2 | awk '{print $1 - $2}' I want to make it... (8 Replies)
Discussion started by: faka
8 Replies

14. Shell Programming and Scripting

Change in the file

Hi, I have a file which has wrong time format and we want to correct it before we load it. WRONG FORMAT : 93:0:00 CORRECT FORMAT :09:30:00 If you notice the 0 at the front is missing. Its the case always. (6 Replies)
Discussion started by: varun22486
6 Replies

15. Shell Programming and Scripting

Note: environment variables within awk

This is not a question. Just a little note, because I've been here some time and never read about awk accessing environment variables. So here's my use case and demonstration of how to use the ENVIRON array. My operating environment is ubuntu 18.04 / docker / GNU awk 4.1.4. ENVIRON seems to posix... (2 Replies)
Discussion started by: stomp
2 Replies