How do I fix line 42: [: too many arguments in Linux?

Question

I have 1 script starting with #!/bin/ksh

Here is the code piece that create line 42: [: too many arguments

if  [ -f "$Log_dir/output.rej" ] && 
    [  grep -Hne "fails to validate" $Log_dir/output.rej >/dev/null ]

it expand to (set -xv)

+ '[' -f /export/home/xxxx/xsdlog/output.rej ']'
+ '[' grep -Hne 'fails to validate' /export/home/xxxx/xsdlog/output.rej ']'
TEST_VALIDATE.sh: line 42: [: too many arguments

I tried

if  [ -f $Log_dir/output.rej ] &&
    [  grep -Hne "fails to validate"   $Log_dir/output.rej >/dev/null ]

without quotes("). The results same.

How do I fix this error?

Answer 1

Stop trying to use the [ command to execute another command.

if ... && grep ...

---

Example:

if  [ -f "$Log_dir/output.rej" ] && 
    grep -Hne "fails to validate" $Log_dir/output.rej >/dev/null
then
    ...
fi