Extension Development, bash scripting

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[edit]

[edit] How does one pass a command-line parameter to a shell script?

The command line parameters are referenced as $1, $2, etc

[edit] Mirroring

If you need to mirror an extension from another server you can write a little shell-script:

<shell>

#!/bin/bash

find extension/ > mirror
exec 3<mirror

cd folder

while read file <&3
do

 target=http://www.foobar.de/typo3conf/ext/
 wget $target$file
 
done

</shell>

Description: With exec 3<mirror you open a new Linux-File-Descriptor. There are unlimited Linux-File-Descriptors. Just don't use 0,1,2 because they are reserved for Linux. In the while-loop there is the condition read file from that descriptor, while file is just a variable which stores each line of mirror.

1) Here is an "one-liner" which does the same thing:

<shell>

find extension/ | sed -r -e 's/(.*?)/http:\/\/www.foobar.de\/typo3conf\/ext\/\1/g' | wget -vv -i - 

</shell>

Of course you can replace the lines:

<shell>

  target=http://www.foobar.de/typo3conf/ext/
  wget $target$file

</shell>

with

<shell>

 target=destination
 mv $file $target

</shell>

or

<shell>

 target=folder
 cp $file $target"/"$file

</shell>

or

<shell>

 target=`echo $file | sed -r -e 's/needle/replace/g'
 cp $file $target

</shell>

[edit] Search and Replace

If you want to search and replace all files in a directory and replace only the first occurrence:

<shell>

find /tmp | xargs perl -pi -e 's/needle/replace/g'

</shell>

Without perl, it is a little more complicated:

<shell>

#!/bin/bash

find extension/ > mirror
exec 3<mirror

while read file <&3
do
 replace=`more $file | sed -r -e 's/needle/replace/g'` 
 cat $replace > $file
done

</shell>

If you already know the filename you can do this:

<shell>

more foobar | sed -r -e 's/needle/replace/g' > foobar

</shell>

Note

Don't you use awk for search and replace!

Again without sed, it is a bit more complicated:

<shell>

more foobar | php -R 'echo preg_replace("/needle/","replace",$argn)."\r\n";' > foobar

</shell>

Of course you can use perl:

<shell>

more foobar | xargs perl -pi -e 's/needle/replace/g'

</shell>

Here is an example taken from my router to show you some other technique how to load a file:

<shell>

1. !/bin/sh

INTERVAL=120

while sleep $INTERVAL do

 // Replace "file" with the file name that has the list of IPs
iplist=/foobar/whitelist
upcount=0
downhosts=""

for i in $(cat ${iplist})
do
       ping -c 1 $i > /dev/null 2>&1

       if  $? -eq 0 
       then
               let upcount+=1
       else
               downhosts="${downhosts} ${i}"
       fi
done

if [ $upcount -eq 0 ]
then
     echo "The following host are down: ${downhosts}"
else
     echo "ping: ${upcount} hosts are up"
fi

done </shell>

--Chibox 05:41, 28 May 2008 (CEST)