Comments on: concatenate strings in bash

By: Modifying $NODE_PATH for Node.js/NPM/NVM « Procbits

Modifying $NODE_PATH for Node.js/NPM/NVM « Procbits — Thu, 20 Oct 2011 15:16:46 +0000

[...] I didn’t even know why you need to use ‘export’. I didn’t know how to concatenate strings in a bash variable. Or, even how to run a command and capture the output in a variable. I also didn’t know how [...]

By: vero

vero — Tue, 11 Oct 2011 14:14:41 +0000

cheers! ^^

By: P. Terson

P. Terson — Fri, 26 Aug 2011 20:13:33 +0000

yay

By: arbit

arbit — Sun, 14 Aug 2011 02:15:16 +0000

thank you very much

By: Ben

Ben — Mon, 07 Mar 2011 22:59:55 +0000

Your example works in the case that both variables being concatenated need to be dereferenced at the time of assignment. In the case that you’d like to concatenate variables and not dereference the values. For example, if you are building up the text of a command to be run in the future

$format= “$1″
$date_cmd= $(echo ‘date ‘ “+$format”)

Now you can run $date_cmd as a command and it will evaluate each time.

By: Helmut

Helmut — Wed, 23 Feb 2011 13:23:00 +0000

Hi!
How do I get the result of the first line and the second line concatenated into one line and added to a text file, not onto two lines like this does it?

ls ./$aa.*|wc -l >> crds.txt;
echo “|”$aa >> crds.txt

instead of
2347
|agency

it should write
2347|agency

Thanks!
Helmut

By: Juha

Juha — Fri, 11 Feb 2011 06:30:50 +0000

And for the catenation I used it like this. Tarstring is used as a part of larger command string.

for i in ../package/*.jpg;do
if [ -f $i ]; then
filename=`basename ${i}`
tarstring=${tarstring}” “${filename}
fi
done

By: Juha

Juha — Fri, 11 Feb 2011 06:27:48 +0000

I would do it something like this. Modify it to meet your requirements. Script does not check the input but it could be done with grep and with the same regural expression what the Filename is using. You can make it more efficient by giving the folder with a parameters. But here is a small help.

FOLDER=`pwd`
cd $FOLDER
TRIPNAME=`basename ${FOLDER}`

for i in *.avi;do
if [ -f $i ]; then
FILENAME=`echo $i |sed ‘s_R$[0-9]*.avi$_\1_’`
echo “mv $i ${TRIPNAME}${FILENAME}”
mv $i ${TRIPNAME}${FILENAME}
fi
done

By: Lyneham

Lyneham — Wed, 26 Jan 2011 16:10:39 +0000

I have a heap of duplicate files (avi and jpegs etc).

File names are often sequencenumber.avi, or sequencenumber.jpg

The parent directory or a directory in the path contains a better description of what the file is.. eg 2008 Files off Camera/trip to paris/R0001.avi (many files look like this.

In those cases I would want the file name to be changed to trip to paris 0001.avi etc.

any idea how I might do this?

By: Eric

Eric — Fri, 15 Oct 2010 22:55:56 +0000

thanks. Cool navigation menu btw