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Full Discussion: Optimizing find with many replacements
Top Forums Shell Programming and Scripting Optimizing find with many replacements Post 303015926 by f77hack on Monday 16th of April 2018 03:22:15 PM
Old 04-16-2018
Optimizing find with many replacements
Hello,

I'm looking for advice on how to optimize this bash script, currently i use the shotgun approach to avoid file io/buffering problems of forks trying to write simultaneously to the same file. i'd like to keep this as a fairly portable bash script rather than writing a C routine.

in a nutshell, there are many conditions in a file that i'm looking to replace strings. any particular file may have some, none or all of the requirements to replace a string.

currently

Code:
Longstring='lots of stuff'
spushd $HOME/somepath

gfind . -depth -name "somefile" -type f -writable -exec gsed -i '1{/^#./! s/.*/'"$Longstring"'/}' {} \;
  gfind . -depth -name "somefile" -type f -writable -exec gsed -i -r 's/ts=4/ts=2/g' {} \;
  gfind . -depth -name "somefile" -type f -writable -exec gsed -i -r 's/sw=4/sw=2/g' {} \;
  gfind . -depth -name "somefile" -type f -writable -exec gsed -i -r 's/tab-width: 4/tab-width: 2/g' {} \;
  gfind . -depth -name "somefile" -type f -writable -exec gsed -i -r 's/mode: tcl/mode: _tcl/g' {} \;
  gfind . -depth -name "somefile" -type f -writable -exec gsed -i -r 's/c-basic-offset: 4/c-basic-offset: 2/g' {} \;
  gfind . -depth -name "somefile" -type f -writable -exec gsed -i -r 's/^\s*(size.*)$/\1/g' {} \;
  gfind . -depth -name "somefile" -type f -writable -exec gsed -i -r 's/^\s*(md.*)$/\1/g' {} \;
  gfind . -depth -name "somefile" -type f -writable -exec gsed -i -r 's/^\s*(rmd.*)$/\1/g' {} \;
  gfind . -depth -name "somefile" -type f -writable -exec gsed -i -r 's/^\s*(sha.*)$/\1/g' {} \;
  gfind . -depth -name "somefile" -type f -writable -exec gsed -i -r 's/^(python.versions.*)$/python.versions 27 36/g' {} \;
  spopd

as you can see, these operations are sequential which can take quite a while.

should i modify the find to do depth first?

can i fork the find and avoid file io problems?

spawn different processes?

thanks
 

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LEARN ABOUT SUNOS

pid

pid(n)                                                         Tcl Built-In Commands                                                        pid(n)

__________________________________________________________________________________________________________________________________________________

NAME

       pid - Retrieve process identifiers

SYNOPSIS

       pid ?fileId?
_________________________________________________________________

DESCRIPTION

       If  the  fileId  argument is given then it should normally refer to a process pipeline created with the open command.  In this case the pid
       command will return a list whose elements are the process identifiers of all the processes in the pipeline, in order.   The  list  will  be
       empty if fileId refers to an open file that is not a process pipeline.  If no fileId argument is given then pid returns the process identi-
       fier of the current process.  All process identifiers are returned as decimal strings.

EXAMPLE

       Print process information about the processes in a pipeline using the SysV ps program before reading the output of that pipeline:

              set pipeline [open "| zcat somefile.gz | grep foobar | sort -u"]
              # Print process information
              exec ps -fp [pid $pipeline] >@stdout
              # Print a separator and then the output of the pipeline
              puts [string repeat - 70]
              puts [read $pipeline]
              close $pipeline

SEE ALSO

       exec(n), open(n)

KEYWORDS

       file, pipeline, process identifier

Tcl                                                                     7.0                                                                 pid(n)
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