Can anyone explain plz

UNIX for Advanced & Expert Users
1

HI,

Can anyone explain to me how does the following command work - >

current_dir=`cd \`/usr/bin/dirname $0\` && pwd`

Regards,
Ranga

2 
$ cat spt
echo $0
current_dir=`cd \`/usr/bin/dirname $0\` && pwd`
echo "current_dir="$current_dir
$ /db2home/training/anbu/spt
/db2home/training/anbu/spt
current_dir=/db2home/training/anbu

cd \`/usr/bin/dirname $0\` cd to script directory
pwd assign the directory to current_dir where script resides.

Instead of above code you can use this

current_dir=`/usr/bin/dirname $0`
3

Hi ,

Thanks for your reply. One more doubt

Does �cd \`/usr/bin/dirname $0\` cd to script directory� will the same change the directory or jus gives u the directory name?

Regards,
Ranga

4

cd \`/usr/bin/dirname $0\` just change directory

In the following code this cd is done within `..` which will open new shell and change directory. So if you come out this line you will be in the same directory as before executing this line.

current_dir=`cd \`/usr/bin/dirname $0\` && pwd`