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 Forum index » Off-Topic Area » Programming
Question about Shell Script (#!/bin/sh)
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RSH


Joined: 05 Sep 2011
Posts: 1564
Location: Germany
PostPosted: Thu 08 Dec 2011, 15:28    Post subject:  Question about Shell Script (#!/bin/sh)  
Hello,

I want to know how can i write multiple lines into a text file via "echo" (or is there another command existing)?

Code:
echo $scriptline >$isopname.files/build-script.sh

writes one line into the text file '.../build-script.sh'. If i use this command again the text file '.../build-script.sh' will be deleted and the new line is written in the new text file '.../build-script.sh'.

How can i get multiple lines into the same text file?

Need it urgently!

RSH
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vovchik


Joined: 23 Oct 2006
Posts: 1239
Location: Ukraine
PostPosted: Thu 08 Dec 2011, 15:50    Post subject:  
Dear RSH,

It is simple and you almost have it. Just use the following:

Code:
echo $scriptline >>$isopname.files/build-script.sh


Notice that the ">" symbol is doubled ">>", which means the information is appended without deleting the original.

With kind regards,
vovchik
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sc0ttman


Joined: 16 Sep 2009
Posts: 2199
Location: UK
PostPosted: Thu 08 Dec 2011, 15:55    Post subject: Re: Question about Shell Script (#!/bin/sh)  
IF I understand what you want correctly,
Code:
echo $scriptline >$isopname.files/build-script.sh

should simply be

Code:
echo "$scriptline" >> $isopname.files/build-script.sh
Note the >> which means 'append to the end of the file'...
Also, I added "" double quotes around $scriptline, in case in contains spaces or newlines

The double quotes mean that $scriptline can be more than one line...

Code:
# VAR="hello
new line"
# echo $VAR
hello new line
# echo "$VAR"
hello
new line
#


Hope this helps... I'm sure others can help more...

EDIT: Just seen vovchiks reply, too...
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RSH


Joined: 05 Sep 2011
Posts: 1564
Location: Germany
PostPosted: Thu 08 Dec 2011, 16:27    Post subject:  
Hello!

Thank you for your fast reply.

Quote:
It is simple and you almost have it. Just use the following.

Code:
echo $scriptline >>$isopname.files/build-script.sh

Oh yes, i know i have seen this before in /usr/sbin/pfbpanel as i modified the menu of my puppy.

Why didn't i realized this? Embarassed

Thank you very much again, vovchik and sc0ttman. Nice to have you (and the forum within all its members as well). Very Happy
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Karl Godt


Joined: 20 Jun 2010
Posts: 2733
Location: Kiel,Germany
PostPosted: Thu 08 Dec 2011, 16:38    Post subject:  
Another solution would be something like this using cat instead of echo :
# cat >>file.ext <<EOT
> #!/bin/sh
> echo "$0 START"
> echo "Now doing some code here"
> echo "$0" END
> EOT
# cat file.ext
#!/bin/sh
echo "/bin/bash START"
echo "Now doing some code here"
echo "/bin/bash" END
#
Code:
cat >>file.ext <<EOT
#!/bin/sh
echo "$0 START"
echo "Now doing some code here"
echo "$0" END
EOT

'>' and '>>' works exactly the same as for echo .
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jpeps

Joined: 31 May 2008
Posts: 2449
PostPosted: Fri 09 Dec 2011, 12:29    Post subject:  
Karl Godt wrote:
Another solution would be something like this using cat instead of echo :
# cat >>file.ext <<EOT
> #!/bin/sh
> echo "$0 START"
> echo "Now doing some code here"
> echo "$0" END
> EOT
# cat file.ext
#!/bin/sh
echo "/bin/bash START"
echo "Now doing some code here"
echo "/bin/bash" END
#
Code:
cat >>file.ext <<EOT
#!/bin/sh
echo "$0 START"
echo "Now doing some code here"
echo "$0" END
EOT

'>' and '>>' works exactly the same as for echo .


That's interesting. "file.ext" keeps writing to itself every time you run it.
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recobayu


Joined: 15 Sep 2010
Posts: 87
Location: indonesia
PostPosted: Fri 09 Dec 2011, 19:26    Post subject: script to repackage after download with ppm  
hi everyone,
i'm sorry where to put my question, i hope in this thread is ok.
i finished download aqualung with ppm, and it was installed on my laptop.
now, i look at /root/.package/aqualung-0.9b11-Lucid.files there are many rows representating the file i download.
it's like this:
Quote:

/usr/
/usr/local/
/usr/local/lib/
/usr/local/lib/X11/
/usr/local/lib/X11/mini-icons/
/usr/local/lib/X11/mini-icons/aqualung.png
/usr/lib/
/usr/lib/libmpcdec.so.3.1.1
/usr/lib/libmpcdec.so.3
...

actually, i can put them one by one. but if there are some script, it can be more fast and interesting.
how to repackage again in a pet or a folder with a script? so i don't need download that aqualung again.
thanks
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jpeps

Joined: 31 May 2008
Posts: 2449
PostPosted: Fri 09 Dec 2011, 19:48    Post subject: Re: script to repackage after download with ppm  
recobayu wrote:
hi everyone,
i'm sorry where to put my question, i hope in this thread is ok.
i finished download aqualung with ppm, and it was installed on my laptop.
now, i look at /root/.package/aqualung-0.9b11-Lucid.files there are many rows representating the file i download.
it's like this:
Quote:

/usr/
/usr/local/
/usr/local/lib/
/usr/local/lib/X11/
/usr/local/lib/X11/mini-icons/
/usr/local/lib/X11/mini-icons/aqualung.png
/usr/lib/
/usr/lib/libmpcdec.so.3.1.1
/usr/lib/libmpcdec.so.3
...

actually, i can put them one by one. but if there are some script, it can be more fast and interesting.
how to repackage again in a pet or a folder with a script? so i don't need download that aqualung again.
thanks


mkdir /tmp/aqualung
cd /tmp/aqualung
cp -p /usr/local/lib/X11/mini-icons/aqualung.png .
cp -p /usr/lib/libmpcdec.so.3* .
...
Last edited by jpeps on Fri 09 Dec 2011, 20:23; edited 1 time in total
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puppyluvr


Joined: 06 Jan 2008
Posts: 3053
Location: Chickasha Oklahoma
PostPosted: Fri 09 Dec 2011, 20:05    Post subject:  
Very Happy Hello,
I dont believe that is a complete list, as the binaries etc are not listed..
Add them all before making a pet..

Anyone want to help with a script to read the final /* lines in any /root/.packages file, then copy the actual files to a dir...
RePet-1.0
I cant remember how to get cat to ignore things...
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jpeps

Joined: 31 May 2008
Posts: 2449
PostPosted: Fri 09 Dec 2011, 20:48    Post subject:  
More sophisticated: Usage newpet [name]

Makes [name].pet in /tmp


Code:

#!/bin/sh

if [ ! -f /root/.packages/${1}.files ]; then
      echo "package doesn't exist"
     exit
 fi

[ -f /tmp/list ] && rm /tmp/list

[ -d /tmp/"$1" ] &&  rm -r /tmp/"$1"

mkdir /tmp/"$1"

for i in `cat /root/.packages/${1}.files`; do
echo "$i" >> /tmp/list
done

while read line; do

  if [ -f $line ]; then

  DIR="$(dirname ${line})"
     [ -d /tmp/${1}/${DIR} ] || mkdir -p /tmp/${1}/${DIR}
 
     cp -p  "$line" /tmp/${1}/${DIR}
fi
done </tmp/list

cd /tmp
dir2pet "$1"


Last edited by jpeps on Fri 09 Dec 2011, 21:10; edited 3 times in total
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RSH


Joined: 05 Sep 2011
Posts: 1564
Location: Germany
PostPosted: Fri 09 Dec 2011, 20:54    Post subject:  
jpeps wrote:
That's interesting. "file.ext" keeps writing to itself every time you run it.

Does it mean, this could be used to create a log file or is it an unwanted 'loop'?

RSH
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recobayu


Joined: 15 Sep 2010
Posts: 87
Location: indonesia
PostPosted: Fri 09 Dec 2011, 21:15    Post subject:  
thanks jpep, now i have aqualung.pet
i like coding, it makes fast. step by step i learn bash programming from this forum. Very Happy
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sunburnt


Joined: 08 Jun 2005
Posts: 4016
Location: Arizona, U.S.A.
PostPosted: Fri 09 Dec 2011, 21:47    Post subject:  
Or you can gather all the lines ( the whole file ) into a variable.
Code:
echo "(Text)" > (File)

This writes the entire multi. lined file in one shot.
The double quotes " " are needed to preserve the line-feeds.
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Karl Godt


Joined: 20 Jun 2010
Posts: 2733
Location: Kiel,Germany
PostPosted: Fri 09 Dec 2011, 22:32    Post subject:  
RSH wrote:
jpeps wrote:
That's interesting. "file.ext" keeps writing to itself every time you run it.

Does it mean, this could be used to create a log file or is it an unwanted 'loop'?
RSH

I always copy the code into the console first .

This was not intended to create any loops at all , but i will play around with it Very Happy Laughing Very Happy

To create a log file it is pssible to use the
Code:
logsave -a logfile.log COMMAND

command
OR
Code:
echo 'DBG : what i wanna say here' >> logfile.log

OR
Code:
cat>logtest.sh <<EndOfText
exec 1>>logfile.log 2>>error.log
echo 'DBG : what i wanna say here'
EndOfText
source logtest.sh &
sleep 1
cat logfile.log
cat error.log

which is the simpliest solution as far as i can tell (look into /etc/rc.d/rc.sysinit for an example [ "$LOGLEVEL" ] || exec 1>/tmp/bootsysinit.log 2>&1 ) .
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PANZERKOPF

Joined: 16 Dec 2009
Posts: 251
Location: Earth
PostPosted: Sat 10 Dec 2011, 13:26    Post subject: Re: Question about Shell Script (#!/bin/sh)  
RSH wrote:
I want to know how can i write multiple lines into a text file via "echo" (or is there another command existing)?

Yet another solution:
echo -e "line1\nline2\nline3\nlineN"
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