How to do a logical OR operation for integer comparison in shell scripting

Question

I am trying to do a simple condition check  but it doesn t seem to work   If    is equal to 0 or is greater than 1 then say hello   I have tried the following syntax with no success   if           0 -o       gt  1     then  echo  hello  fi  if           0              gt  1     then  echo  hello  fi

User · Answer

If you are using the bash exit code status $? as variable, it's better to do this:

if [ $? -eq 4 -o $? -eq 8 ] ; then  
   echo "..."
fi

Because if you do:

if [ $? -eq 4 ] || [ $? -eq 8 ] ; then

The left part of the OR alters the $? variable, so the right part of the OR doesn't have the original $? value.

User · Answer

Sometimes you need to use double brackets  otherwise you get an error like too many arguments  if     OUTMERGE      fatal             OUTMERGE      Aborting        then fi

User · Answer

This code works for me      bin sh  argc    echo  argc if    argc -eq 0 -o  argc -eq 1    then   echo  foo  else   echo  bar  fi   I don t think sh supports       Use     to compare strings and -eq to compare ints   man test   for more details

User · Answer

This should work      bin bash  if        -eq 0             -gt 1     then     echo  hello  fi   I m not sure if this is different in other shells but if you wish to use  lt      you need to put them inside double parenthesis like so    if         gt  1

User · Answer

And in Bash   line1  tail -3  opt Scripts wowzaDataSync log   grep  AmazonHttpClient    head -1   vpid  ps -ef   grep wowzaDataSync   grep -v grep    awk   print  2     echo  -------- gt    line1      if   -z  line1    amp  amp      -z  vpid       then             echo  date --date  NOW    Y- m- d   date --date  NOW    H  M  S                   Process Is Working Fine      else             echo  date --date  NOW    Y- m- d   date --date  NOW    H  M  S                   Prcess Hanging Due To Exception With PID     pid     fi   OR in Bash  line1  tail -3  opt Scripts wowzaDataSync log   grep  AmazonHttpClient    head -1  vpid  ps -ef   grep wowzaDataSync   grep -v grep    awk   print  2    echo  -------- gt    line1     if   -z  line1          -z  vpid       then             echo  date --date  NOW    Y- m- d   date --date  NOW    H  M  S                   Process Is Working Fine      else             echo  date --date  NOW    Y- m- d   date --date  NOW    H  M  S                   Prcess Hanging Due To Exception With PID     pid    fi

User · Answer

If a bash script   If     input -gt number       input  -lt number     then      echo           else     echo            fi  exit

User · Answer

From Bash Reference Manual   3 4 2 Special Parameters              Expands to the number of positional parameters in decimal    Therefore     will always be either 0 or a bigger integer   So if you want to do something whenever    is either 0 or bigger than 1  you just have to check if    is or is not 1        -eq 1    amp  amp  echo  1 positional param     echo  0 or more than 1    This uses the syntax     condition    amp  amp   things if true      things if false

User · Answer

have you tried something like this   if      -eq 0           -gt 1    then  echo      fi

[bash] How to do a logical OR operation for integer comparison in shell scripting?

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