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Bourne/bash shell scripts: string comparison | Bourne shell scripting | Tech-Recipes

Started by qdideas · 9 months ago

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7 comments

  • Anonymous

    5 years ago

    Wouldn't the following be better?

    if [ -z $var ];then
    echo null
    fi
    reply
  • Anonymous

    8 months ago

    i believe the $var needs to be in quotes, like so:

    if [ -z "$var" ];then
    echo null
    fi

    Best Regards,
    Kibokina
    reply
  • guest

    5 years ago

    the following syntax is wrong

    if [ $var == "" ] ......

    because if the variable $var is empty the test is
    if [ == "" ] and gives an error

    you are obliged to quote the var :
    if [ "$var" == "" ] ...


    Sergio
    reply
  • BhupinderSingh

    4 years ago

    this can also be used to compare 2 strings

    s1 = "as"
    s2 = "bs"

    if test $s1 == $s2
    then
    echo s1 and s2 are equal
    fi
    reply
  • bhargav

    3 months ago

    if [ "$var" = "value" ]
    then
    echo not the same
    fi
    reply
  • asd

    3 months ago

    These examples don't work.
    reply
  • Florin

    2 months ago

    This is the method i curently to test if a string is empty:

    if [ "X${VAR}" = "X" ]; then
    echo "Empty string"
    fi

    Testing for equality follows the same logic but without X.
    reply

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