Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.
Auto create complete directory structure when copying files in Linux
Answer:
Assume you are copying file using the command below:
# cp foo/bar/test.txt /tmp/
The result is test.txt will be placed inside the folder /tmp/.
In order to let the cp command auto create the foo/bar/ directory structure under /tmp, you can try the command:
# cp --parent foo/bar/test.txt /tmp/
How to find the largest files and directories in Linux?
Answer:
For example, to list out top 10 files and directories inside /opt, you can use the following command:
# du -a /opt| sort -nr | head -n 10
Revert the effect of an earlier changeset in Mercurial
Answer:
In Mercurial, if you want to revert the effect of an earlier changeset, even the changes have been pushed to remote, it is still possible with the hg backout command.
1. Find the revision you want to backout using hg log
# hg log
2. Assume you want to backout to the revision 99, then you can
# hg backout -r 99
Printing the exclamation mark using echo
Answer:
You might observed a problem when you try to print the exclamation mark (!) using the echo command
E.g.
# echo "test!"
-bash: !": event not foundTo solve it, you can use single quote instead
# echo 'test!'
test!Renew DHCP IP address in Ubuntu
Answer:
To rename an IP address using DHCP in Ubuntu, try enter the commands below:
1. Release the current IP
# sudo dhclient -r2. Renew a new IP
# sudo dhclient