Using if elif fi in shell scripts

Question

I m not sure how to do an if with multiple tests in shell  I m having trouble writing this script   echo  You have provided the following arguments  arg1  arg2  arg3  if     arg1      arg2   amp  amp    arg1       arg3    then     echo  Two of the provided args are equal       exit 3 elif    arg1    arg2  amp  amp   arg1    arg3   then     echo  All of the specified args are equal      exit 0 else     echo  All of the specified args are different      exit 4 fi   The problem is I get this error every time        compare sh     missing     command not found

User · Accepted Answer

sh is interpreting the  amp  amp  as a shell operator  Change it to -a  that   s     s conjunction operator       arg1      arg2  -a   arg1       arg3      Also  you should always quote the variables  because   gets confused when you leave off arguments

User · Answer

I have a sample from your code  Try this    echo   Select Option    echo  1 - script1  echo  2 - script2  echo  3 - script3   read option echo  You have selected   option    if    option  1    then     echo  1  elif    option  2    then     echo  2      exit 0 elif    option  3    then     echo  3      exit 0 else     echo  Please try again from given options only   fi   This should work

User · Answer

Change   to     and   to

User · Answer

Josh Lee s answer works  but you can use the   amp  amp   operator for better readability like this   echo  You have provided the following arguments  arg1  arg2  arg3  if     arg1      arg2     amp  amp      arg1       arg3    then      echo  Two of the provided args are equal       exit 3 elif    arg1    arg2    amp  amp      arg1    arg3   then     echo  All of the specified args are equal      exit 0 else     echo  All of the specified args are different      exit 4  fi

User · Answer

This is working for me      cat checking sh     bin bash  echo  You have provided the following arguments  arg1  arg2  arg3   if     arg1      arg2     amp  amp      arg1       arg3     then      echo  Two of the provided args are equal        exit 3  elif    arg1     arg2    amp  amp     arg1    arg3    then      echo  All of the specified args are equal       exit 0  else      echo  All of the specified args are different       exit 4  fi       checking sh  You have provided the following arguments  All of the specified args are equal   You can add set -x in script to troubleshoot the errors

User · Answer

Use double brackets     if    expression

[bash] Using if elif fi in shell scripts

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