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Top Forums Shell Programming and Scripting Sorting the contents of a variable Post 303034987 by jgt on Friday 10th of May 2019 12:13:22 PM
Old 05-10-2019
Sorting the contents of a variable

i want to reduce the OPTIONS variable which is a list of email addresses to just the unique entries. The following works, but, i would like to accomplish it without using the temporary file (dest.txt)



Code:
$echo $OPTIONS                         
a b c A B D                                         
$cat clean                             
#!/usr/bin/bash                                     
n=$#                                                
i=1                                                 
cat /dev/null >/usr/spool/lp/temp/dest.txt          
while [ $i -le $n ]                                 
do                                                  
        c=$(echo $1 |tr "[:upper:]" "[:lower:]" )   
        echo $c>>/usr/spool/lp/temp/dest.txt        
        shift                                       
        let i=$i+1                                  
done                                                
sort -u </usr/spool/lp/temp/dest.txt                
                                                    
$ OPTIONS1=$(./clean $OPTIONS)          
$ echo $OPTIONS1                        
a b c d                                             
$

 

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TMPFILE(3)								 1								TMPFILE(3)

tmpfile - Creates a temporary file

SYNOPSIS
resource tmpfile (void ) DESCRIPTION
Creates a temporary file with a unique name in read-write (w+) mode and returns a file handle . The file is automatically removed when closed (for example, by calling fclose(3), or when there are no remaining references to the file handle returned by tmpfile(3)), or when the script ends. For details, consult your system documentation on the tmpfile(3) function, as well as the stdio.h header file. RETURN VALUES
Returns a file handle, similar to the one returned by fopen(3), for the new file or FALSE on failure. EXAMPLES
Example #1 tmpfile(3) example <?php $temp = tmpfile(); fwrite($temp, "writing to tempfile"); fseek($temp, 0); echo fread($temp, 1024); fclose($temp); // this removes the file ?> The above example will output: writing to tempfile SEE ALSO
tempnam(3), sys_get_temp_dir(3). PHP Documentation Group TMPFILE(3)
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