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Quote:
variables in single quotes are treated as const. string as 1. var = 5 ; echo '$var' This will simply display the string $var as it is, no variable replacement by value. 2. var = 5; echo "$var" In double quotes variables get expansion in terms of its value. o/p will be 5 Similarly is the case with grep '$var' and grep "$var". But when it comes to constant string, it hardly reflects any change. grep -w "string1 string2" file1 grep -w 'string1 string2" file1 Both are same. Hope you get this !! |
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