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Full Discussion: current logged in user
Top Forums Shell Programming and Scripting current logged in user Post 302567133 by MacMonster on Saturday 22nd of October 2011 12:05:56 PM
Old 10-22-2011
"users" command would be the best choice as it only outputs the usernames without extra useless text.

Username may contain a dot that requires extra handling in regular expression, so I think use a loop to compare the string is easier than using grep.

Code:
#!/bin/bash

user="$1"
found=0

for i in `users`; do
    if [ "$i" == "$user" ]; then
        found=1
        break
    fi
done

if [ "$found" -eq 1 ]; then
    echo "User logged in."
else
    echo "User not logged in."
fi

This User Gave Thanks to MacMonster For This Post:
 

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STRISTR(3)								 1								STRISTR(3)

stristr - Case-insensitivestrstr(3)

SYNOPSIS
string stristr (string $haystack, mixed $needle, [bool $before_needle = false]) DESCRIPTION
Returns all of $haystack starting from and including the first occurrence of $needle to the end. PARAMETERS
o $haystack - The string to search in o $needle - If $needle is not a string, it is converted to an integer and applied as the ordinal value of a character. o $before_needle - If TRUE, stristr(3) returns the part of the $haystack before the first occurrence of the $needle (excluding needle). $needle and $haystack are examined in a case-insensitive manner. RETURN VALUES
Returns the matched substring. If $needle is not found, returns FALSE. CHANGELOG
+--------+-----------------------------------------------+ |Version | | | | | | | Description | | | | +--------+-----------------------------------------------+ | 5.3.0 | | | | | | | Added the optional parameter $before_needle. | | | | | 4.3.0 | | | | | | | stristr(3) was made binary safe. | | | | +--------+-----------------------------------------------+ EXAMPLES
Example #1 stristr(3) example <?php $email = 'USER@EXAMPLE.com'; echo stristr($email, 'e'); // outputs ER@EXAMPLE.com echo stristr($email, 'e', true); // As of PHP 5.3.0, outputs US ?> Example #2 Testing if a string is found or not <?php $string = 'Hello World!'; if(stristr($string, 'earth') === FALSE) { echo '"earth" not found in string'; } // outputs: "earth" not found in string ?> Example #3 Using a non "string" needle <?php $string = 'APPLE'; echo stristr($string, 97); // 97 = lowercase a // outputs: APPLE ?> NOTES
Note This function is binary-safe. SEE ALSO
strstr(3), strrchr(3), stripos(3), strpbrk(3), preg_match(3). PHP Documentation Group STRISTR(3)
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