Can I call a function of a shell script from another shell script

Question

I have 2 shell scripts   The second shell script contains following functions second sh  func1  func2   The first sh will call the second shell script with some parameters and  will call func1 and func2 with some other parameters specific to that function   Here is the example of what I am talking about  second sh  val1  echo  1  val2  echo  2   function func1    fun  echo  1  book  echo  2      function func2    fun2  echo  1  book2  echo  2        first sh  second sh cricket football  func1 love horror func2 ball mystery   How can I achieve it

User · Answer

If you define          bin bash         fun1              echo  Fun1 from file1  1            fun1 Hello   file2  fun1 Hello exit 0   in file1 chmod 750 file1  and file2     fun1          echo  Fun1 from file2  1            fun2          echo  Fun1 from file1  1          and run   file2 you ll get  Fun1 from file1 Hello Fun1 from file2 Hello Surprise    You overwrite fun1 in file1 with fun1 from file2    So as not to do so you  must  declare -f pr fun1  fun1   file2 unset -f fun1 fun1  pr fun1 unset -f pr fun1 fun1 Hello   it s save your previous definition for fun1 and restore it with the previous name deleting not needed imported one  Every time you import functions from another file you may remember two aspects    you may overwrite existing ones with the same names if that the thing you want you must preserve them as described above  import all content of import file functions and global variables too  Be careful   It s dangerous procedure

User · Answer

vi function sh     bin bash f1         echo  Hello  name     f2         echo  Enter your name        read name     f1   f2   sh function sh   Here function f2 will call function f1

User · Answer

The problem  The currenly accepted answer works only under important condition  Given      foo bar first sh   function func1        echo  Hello  1      and   foo bar second sh      bin bash  source   first sh func1 World   this works only if the first sh is executed from within the same directory where the first sh is located  Ie  if the current working path of shell is  foo  the attempt to run command   cd  foo   bar second sh   prints error    foo bar second sh  line 4  func1  command not found   That s because the source   first sh is relative to current working path  not the path of the script  Hence one solution might be to utilize subshell and run   cd  foo bar    second sh    More generic solution  Given      foo bar first sh   function func1        echo  Hello  1      and   foo bar second sh      bin bash  source   dirname   0   first sh  func1 World   then   cd  foo   bar second sh   prints  Hello World   How it works    0 returns relative or absolute path to the executed script dirname returns relative path to directory  where the  0 script exists     dirname   0    the dirname   0  command returns relative path to directory of executed script  which is then used as argument for source command  in  second sh    first sh just appends the name of imported shell script  source loads content of specified file into current shell

User · Answer

You can t directly call a function in another shell script   You can move your function definitions into a separate file and then load them into your script using the   command  like this      path to functions sh   This will interpret functions sh as if it s content were actually present in your file at this point   This is a common mechanism for implementing shared libraries of shell functions

User · Answer

Refactor your second sh script like this   function func1      fun  1    book  2    printf  fun  s book  s n     fun      book      function func2      fun2  1    book2  2    printf  fun2  s book2  s n     fun2      book2       And then call these functions from script first sh like this   source   second sh func1 love horror func2 ball mystery   OUTPUT   fun love book horror fun2 ball book2 mystery

[shell] Can I call a function of a shell script from another shell script?

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