Every single redirection opens, reads / writes, and closes the target file. So, for every loop of your script you're handling roughly 80 file operations (times 2, for open and close). Try redirecting the entire script's output, e.g. like
.
And, you're running 17 greps per loop, each causing a process creation with its resource consumption, - try running it once with either an alternation search pattern ("PAT1|PAT2|PAT3") or a pattern file (-f option), which would simplify some later treatment, and deal with your pretty print later with e.g. a single sort and / or a single awk command.
Hello,
I have a Supermicro server with a P4SCI mother board running Debian Sarge 3.1. This is the "dmidecode" output related to RAM info:
RAM speed information is incomplete.. "Current Speed: Unknown", is there anyway/soft to get the speed of installed RAM modules? thanks!!
Regards :)... (0 Replies)
hi i have a script that is taking the difference of multiple columns in a file from a value from a single row..so far i have a loop to do that.. all the data is floating point..fin has the difference between array1 and array2..array1 has 700 x 300= 210000 values and array2 has 700 values..
... (11 Replies)
Hey together,
You should know, that I'am relatively new to shell scripting, so my solution is probably a little awkward.
Here is the script:
#!/bin/bash
live_dir=/var/lib/pokerhands/live
for limit in `find $live_dir/ -type d | sed -e s#$live_dir/##`; do
cat $live_dir/$limit/*... (19 Replies)
I have a script that processes a fair amount of data -- say, 25-50 megs per run. I'd like ideas on speeding it up. The code is actually just a preprocessor -- I'm using another language to do the heavy lifting. But as it happens, the preprocessing takes much more time than the final processing... (3 Replies)
I analysed disk performance with blktrace and get some data:
read:
8,3 4 2141 2.882115217 3342 Q R 195732187 + 32
8,3 4 2142 2.882116411 3342 G R 195732187 + 32
8,3 4 2144 2.882117647 3342 I R 195732187 + 32
8,3 4 2145 ... (1 Reply)
Hi Guys,
I have a script that I am using to convert some text files to xls files. I create multiple temp. files in the process of conversion. Other than reducing the temp. files, are there any general tricks to help speed up the script?
I am running it in the bash shell.
Thanks. (6 Replies)
I had written a perl script to compare two files: new and master and get the output of the first file i.e. the first file: words that are not in the master file
STRUCTURE OF THE TWO FILES
The first file is a series of names
ramesh
sushil
jonga
sudesh
lugdi
whereas the second file (could be... (4 Replies)
Hi,
Im quite new to scripting and would like a bit of assistance with trying to speed up the following script. At the moment it is quite slow....
Any way to improve it?
total=111120
while
do
total=`expr $total + 1`
INCREMENT=$total
firstline = "blablabla"
secondline = "blablabla"... (5 Replies)
hey guys i have a perl script wich use to compare hashes but it tookes a long time to do that so i wich i will have the soulition to do it soo fast
he is the code
<redacted> (1 Reply)
Hi
I have written a shell script which will test 300 to 500 IPs to find which are pinging and which are not pinging.
the script which give output as
10.x.x.x is pining
10.x.x.x. is not pining
-
-
-
10.x.x.x is pining
like above.
But, this script is taking... (6 Replies)
Discussion started by: kumar85shiv
6 Replies
LEARN ABOUT PLAN9
grep
GREP(1) General Commands Manual GREP(1)NAME
grep - search a file for a pattern
SYNOPSIS
grep [ option ... ] pattern [ file ... ]
DESCRIPTION
Grep searches the input files (standard input default) for lines (with newlines excluded) that match the pattern, a regular expression as
defined in regexp(6). Normally, each line matching the pattern is `selected', and each selected line is copied to the standard output.
The options are
-c Print only a count of matching lines.
-h Do not print file name tags (headers) with output lines.
-i Ignore alphabetic case distinctions. The implementation folds into lower case all letters in the pattern and input before interpre-
tation. Matched lines are printed in their original form.
-l (ell) Print the names of files with selected lines; don't print the lines.
-L Print the names of files with no selected lines; the converse of -l.
-n Mark each printed line with its line number counted in its file.
-s Produce no output, but return status.
-v Reverse: print lines that do not match the pattern.
Output lines are tagged by file name when there is more than one input file. (To force this tagging, include /dev/null as a file name
argument.)
Care should be taken when using the shell metacharacters $*[^|()= and newline in pattern; it is safest to enclose the entire expression in
single quotes '...'.
SOURCE
/sys/src/cmd/grep.c
SEE ALSO ed(1), awk(1), sed(1), sam(1), regexp(6)DIAGNOSTICS
Exit status is null if any lines are selected, or non-null when no lines are selected or an error occurs.
GREP(1)