How to call one shell script from another shell script

Question

I have two shell scripts  a sh and b sh   How can I call b sh from within the shell script a sh

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Check this out      bin bash echo  This script is about to run another script   sh   script sh echo  This script has just run another script

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pathToShell   home praveen      chmod a x  pathToShell myShell sh  sh  pathToShell myShell sh

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The answer which I was looking for     exec  path to script      As mentioned  exec replaces the shell without creating a new process  However  we can put it in a subshell  which is done using the parantheses    EDIT  Actually    path to script    is enough

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First you have to include the file you call      bin bash   includes included file sh   then you call your function like this      bin bash my called function

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Just add in a line whatever you would have typed in a terminal to execute the script  e g      bin bash   myscript sh  amp    if the script to be executed is not in same directory  just use the complete path of the script  e g    home user script-directory   myscript sh  amp

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Assume the new file is   home satya app app specific env  and the file contents are as follows    bin bash  export FAV NUMBER  2211    Append this file reference to    bashrc file  source  home satya app app specific env   When ever you restart the machine or relogin  try echo  FAV NUMBER in the terminal  It will output the value    Just in case if you want to see the effect right away  source    bashrc in the command line

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The top answer suggests adding    bin bash line to the first line of the sub-script being called  But even if you add the shebang  it is much faster  to run a script in a sub-shell and capture the output     source SCRIPT NAME    This works when you want to keep running the same interpreter  e g  from bash to another bash script  and ensures that the shebang line of the sub-script is not executed   For example      bin bash SUB SCRIPT   mktemp  echo     bin bash   gt   SUB SCRIPT echo  echo  1   gt  gt   SUB SCRIPT chmod  x  SUB SCRIPT if     1     --source      then   for X in   seq 100   do     MODE   source  SUB SCRIPT  source on     done else   for X in   seq 100   do     MODE    SUB SCRIPT  source off     done fi echo  MODE rm  SUB SCRIPT   Output         time   test sh source off   test sh  0 15s user 0 16s system 87  cpu 0 360 total        time   test sh --source source on   test sh --source  0 05s user 0 06s system 95  cpu 0 114 total       For example when virus or security tools are running on a device it might take an extra 100ms to exec a new process

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Simple source will help you  For Ex      bin bash echo  My shell 1  source my script1 sh echo  Back in shell 1

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This was what worked for me  this is the content of the main sh script that executes the other one     bin bash  source  path to other sh

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There are some problems to import functions from other file  First  You needn t to do this file executable  Better not to do so  just add     file   to import all functions  And all of them will be as if they are defined in your file  Second  You may be define the function with the same name  It will be overwritten  It s bad  You may declare like that  declare -f new function name old function name    and only after that do import  So you may call old function by new name  Third  You may import only full list of functions defined in file  If some not needed you may unset them  But if you rewrite your functions after unset they will be lost  But if you set reference to it as described above you may restore after unset with the same name  Finally In common procedure of import is dangerous and not so simple  Be careful  You may write script to do this more easier and safe  If you use only part of functions not all  better split them in different files  Unfortunately this technique not made well in bash  In python for example and some other script languages it s  easy and safe  Possible to make partial import only needed functions with its own names  We all want that in next bush versions will be done the same functionality  But now We must write many additional cod so as to do what you want

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bin bash     Here you define the absolute path of your script   scriptPath   home user pathScript       Name of your script   scriptName  myscript sh      Here you execute your script    scriptPath  scriptName     Result of script execution   result

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There are a couple of ways you can do this  Terminal to execute the script      bin bash SCRIPT PATH   path to script sh     Here you execute your script   SCRIPT PATH     or     SCRIPT PATH     or source   SCRIPT PATH     or bash   SCRIPT PATH     or eval    SCRIPT PATH      or OUTPUT     SCRIPT PATH   echo  OUTPUT    or OUTPUT    SCRIPT PATH   echo  OUTPUT    or    SCRIPT PATH      or  exec   SCRIPT PATH     All this is correct for the path with spaces

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Depends on  Briefly    If you want load variables on current console and execute you may use source myshellfile sh on your code  Example      bin bash set -x echo  This is an example of run another INTO this session   source my lib of variables and functions sh echo  The function internal function   is defined into my lib   returned value internal function   echo  this is an internal variable  set  x   If you just want to execute a file and the only thing intersting for you is the result  you can do      bin bash set -x   executing only sh sh i can execute this way too sh bash or this way sh set  x   I hope helps you  Thanks

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There are a couple of different ways you can do this    Make the other script executable  add the    bin bash line at the top  and the path where the file is to the  PATH environment variable  Then you can call it as a normal command  Or call it with the source command  alias is    like this  source  path to script  Or use the bash command to execute it   bin bash  path to script    The first and third methods execute the script as another process  so variables and functions in the other script will not be accessible  The second method executes the script in the first script s process  and pulls in variables and functions from the other script so they are usable from the calling script    In the second method  if you are using exit in second script  it will exit the first script as well  Which will not happen in first and third methods

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Use backticks       script-that-consumes-argument sh  sh script-that-produces-argument sh    Then fetch the output of the producer script as an argument on the consumer script

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If you have another file in same directory  you can either do   bash another script sh   or  source another script sh   or     another script sh   When you use bash instead of source  the script cannot alter environment of the parent script  The   command is POSIX standard while source command is a more readable bash synonym for    I prefer source over     If your script resides elsewhere just provide path to that script  Both relative as well as full path should work

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You can use  bin sh to call or execute another script  via your actual script       cat showdate sh     bin bash  echo  Date is   date       cat mainscript sh     bin bash  echo  You are login as   whoami    echo    bin sh   showdate sh     exact path for the script file   The output would be        mainscript sh  You are login as  root  Date is  Thu Oct 17 02 56 36 EDT 2013

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chmod a x  path to file-to-be-executed   That was the only thing I needed  Once the script to be executed is made executable like this  you  at least in my case  don t need any other extra operation like sh or    while you are calling the script   Thanks to the comment of  Nathan Lilienthal

[bash] How to call one shell script from another shell script?

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