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Full Discussion: Parse output path to set variable
Top Forums Shell Programming and Scripting Parse output path to set variable Post 302737273 by Corona688 on Wednesday 28th of November 2012 03:56:12 PM
Old 11-28-2012
Running awk 10,000 times to handle 10,000 individual lines is like making 10,000 phone calls to say 10,000 words. If you're not going to use awk on more than one line at once you shouldn't bother using it at all. It's not a builtin. It's a programming language. Imagine running perl 10,000 times to handle 10,000 lines. Same problem.

You don't even need it. Ordinary shell operations will work here. Here's one method:

Code:
OLDIFS="$IFS"
IFS=" /"

while read LINE
do
        # Divide "39292 /home/project_A/users/jdoe" into
        # $1=39292, $2=home, $3=project_A, $4=users, $5=djoe
        set -- $LINE

        COUNT=$1 # Save the total
        shift $(($# - 1)) # Turf all but the last argument
        USER=$1 # That will be the username

done < inputfile

IFS="$OLDIFS"

Zero external commands per line instead of two.
This User Gave Thanks to Corona688 For This Post:
Yoda
 

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LEARN ABOUT NETBSD

timespecsub

TIMERADD(3)						   BSD Library Functions Manual 					       TIMERADD(3)

NAME

     timeradd -- operations on time structure

SYNOPSIS

     #include <sys/time.h>

     void
     timeradd(struct timeval *a, struct timeval *b, struct timeval *res);

     void
     timersub(struct timeval *a, struct timeval *b, struct timeval *res);

     void
     timerclear(struct timeval *tv);

     int
     timerisset(struct timeval *tv);

     int
     timercmp(struct timeval *a, struct timeval *b, CMP);

     void
     timespecadd(struct timespec *a, struct timespec *b, struct timespec *res);

     void
     timespecsub(struct timespec *a, struct timespec *b, struct timespec *res);

     void
     timespecclear(struct timespec *ts);

     int
     timespecisset(struct timespec *ts);

     int
     timespeccmp(struct timespec *a, struct timespec b, CMP);

DESCRIPTION

     These macros are provided for manipulating the timeval and timespec structures described in timeval(3).

     The timeradd() and timespecadd() macros add the time information stored in a to b, storing the result in res.  With timeradd() the results
     are simplified such that the value of res->tv_usec is always less than 1,000,000 (1 second).  With timespecadd() the res->tv_nsec member of
     struct timespec is always less than 1,000,000,000.

     The timersub() and timespecsub() macros subtract the time information stored in b from a and store the resulting structure in res.

     The timerclear() and timespecclear() macros initialize the structures to midnight (0 hour) January 1st, 1970 (the Epoch).	In other words,
     they set the members of the structure to zero.

     The timerisset() and timespecisset() macros return true if the input structure is set to any time value other than the Epoch.

     The timercmp() and timespeccmp() macros compare a to b using the comparison operator given in CMP.  The result of the comparison is returned.

SEE ALSO

     timeval(3)

HISTORY

     The timeradd() family of macros first appeared in NetBSD 1.1.  These were later ported to FreeBSD 2.2.6.  The timespec() family of macros
     first appeared in NetBSD 1.2.

BSD
								   June 7, 2010 							       BSD
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