Compare a string using sh shell

Question

I am using SH shell and I am trying to compare a string with a variable s value but the if condition is always execute to true  Why   Here is some code   Sourcesystem  ABC   if     Sourcesystem  -eq  XYZ     then      echo  Sourcesystem Matched   else     echo  Sourcesystem is NOT Matched  Sourcesystem    fi   echo Sourcesystem Value is   Sourcesystem     Even this is not working   Sourcesystem  ABC   if    XYZ  -eq   Sourcesystem     then      echo  Sourcesystem Matched   else     echo  Sourcesystem is NOT Matched  Sourcesystem    fi   echo Sourcesystem Value is   Sourcesystem     Secondly  can we match this with a NULL or empty string

User · Answer

Of the 4 shells that I ve tested   ABC -eq XYZ evaluates to true in the test builtin for zsh and ksh    The expression evaluates to false under  usr bin test and the builtins for dash and bash   In ksh and zsh  the strings are converted to numerical values and are equal since they are both 0   IMO  the behavior of the builtins for ksh and zsh is incorrect  but the spec for test is ambiguous on this

User · Answer

-eq is used to compare integers  Use   instead

User · Answer

-eq is the shell comparison operator for comparing integers  For comparing strings you need to use

User · Answer

I had this same problem  do this if    xyz     abc     then   echo  quot match quot  fi  Notice the whitespace  It is important that you use a whitespace in this case after and before the   sign  Check out  quot Other Comparison Operators quot

User · Answer

-eq is a mathematical comparison operator   I ve never used it for string comparison  relying on    and    for compares   if    XYZ      ABC     then     Double equal to will work in Linux but not on HPUX boxes it should be if    XYZ     ABC    which will work on both   echo  Match  else   echo  No Match  fi

User · Answer

You should use the   operator for string comparison   Sourcesystem  ABC   if     Sourcesystem     XYZ     then      echo  Sourcesystem Matched   else     echo  Sourcesystem is NOT Matched  Sourcesystem    fi    man test says that you use -z to match for empty strings

User · Answer

eq is used to compare integers use equal     instead    example   if    AAA     ABC     then      echo  the same   else      echo  not the same  fi   good luck

[shell] Compare a string using sh shell

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