Compilation error character is missing-unix shell script

Question

I need to find out 3 files in my UBM unix directory,if any one(CMUSER) file is available means,then i need to exit from my unix script,

Below is my unix shell script logic. Why am I getting compilation error?

cd /$UBCS
if [ -f /$UBM/CSUSER.LOCKED -o -f /$UBM/CSUSER.START]
     -o f /$UBM/CSUSER.UPDATE ];
then
   exit;
fi

my compilation error below

Enter script to execute: atm-autopbf
/rd23/gilbat/R2016/ubcs/atm-autopbf[38]: test: 0403-021 **A ] character is missing**
.
/rd23/gilbat/R2016/ubcs/atm-autopbf**[39]: -o:  **not found.****

 Not running C/S (SHELMATE MAXSESSIONS=0). Aborting ...

Press <ENTER> to continue:

Kusalananda · Accepted Answer · 2017-02-15 23:00:03Z

Your script,

cd /$UBCS
if [ -f /$UBM/CSUSER.LOCKED -o -f /$UBM/CSUSER.START]
     -o f /$UBM/CSUSER.UPDATE ];
then
   exit;
fi

has a syntax error. You have unbalanced [ ... ] in the if-statement. You also need a space between /$UBM/CSUSER.START and the following ].

#!/bin/sh

cd "/$UBCS" || exit 1

if [ -f "/$UBM/CSUSER.LOCKED" ] ||
   [ -f "/$UBM/CSUSER.START"  ] ||
   [ -f "/$UBM/CSUSER.UPDATE" ]
then
   exit
fi

Do try pasting your scripts into ShellCheck: https://www.shellcheck.net/

Also, you don't get compilation errors for shell scripts (as they are not compiled). They are parsing errors.

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