Posts Tagged ‘grep’

Pseudothreading with BASH

January 20, 2010

It’s more like a trick, but it’s better than repeat the same operation linearly. Some explanations:

TH_NUM=`ps aux | grep Python | grep -v "grep" | wc -l`

  • TH_MAX is the maximum number of “threads” that can be executed at the same time.
  • The first grep selects the threads that make use of python (you can change this, it depends on your script)
  • The second grep excludes the command you issued above ;)
  • wc counts the number of lines. The first time the result of the pipe is empty, so wc gives “0″ as result.

#!/bin/bash
TH_MAX=10
for sample in `ls ./data`
do
while [ TRUE ]; do
TH_NUM=`ps aux | grep Python | grep -v "grep" | wc -l`
if [ "$TH_NUM" -le "$TH_MAX" ]
then
echo $( ./analyze_sample.py -s ${sample} ) > /dev/null &
echo -en " ${sample} "
break
else
echo -en "."
sleep 1
fi
done
done

Remove all binaries from a directory tree

June 4, 2008

Here is a one liner that packs some serious bash punch:

rm `find . -type f -exec file ‘{}’ \; | grep -i linux | awk -F: ‘{print $1}’`


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