Order of execution seem to be reversed with pipe Post: 302589530

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Top Forums UNIX for Advanced & Expert Users Order of execution seem to be reversed with pipe Post 302589530 by mirni on Thursday 12th of January 2012 04:20:11 AM

01-12-2012

Registered User

Please use code tags when posting code or sample i/o-put.

There are several things worth noting on your script:

1. Shell loops through file lines are very ineffective. You are using filters, which are operating on one line at a time, and are optimized for this kind of processing. No need for the shell loop.
2. sed command can be gotten rid of, if the FS of awk is specified in a more general way, e.g. -F'\\^ *' would eat up the spaces after the delimiter, or even more general -F' *\\^ *', which would handle situation with spaces before or/and after the ^.
3. The strangest thing there though, is that you redirect the output into the same file, for each line, and you are using the > operator, which will truncate it to zero length. So actually you will not get anything but the last line processed.
4. Useless use of cat

Let me suggest a better way to accomplish this:

Code:

outputFile="${WORK_DIR}/${PREFIX}_rename.txt"
: > outputFile  #truncate the file to zero length, just in case it exists already
awk -F' *\\^ *' -v output=$outputFile '/\.pdf/ {print $1"|ALCV"$2"-"$1"|"$3 >> output}'  $FILE

mirni

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LEARN ABOUT SUSE

suspend

suspend(1)                                                         User Commands                                                        suspend(1)

NAME

       suspend - shell built-in function to halt the current shell

SYNOPSIS

   sh
       suspend

   csh
       suspend

   ksh
       suspend

DESCRIPTION

   sh
       Stops the execution of the current shell (but not if it is the login shell).

   csh
       Stop the shell in its tracks, much as if it had been sent a stop signal with ^Z. This is most often used to stop shells started by su.

   ksh
       Stops the execution of the current shell (but not if it is the login shell).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), kill(1), ksh(1), sh(1), su(1M), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                         suspend(1)