Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.
How to add a directory into the PATH environment variable?
Answer:
To add a new directory into the PATH environment variable, you can use the following command.
# export PATH=$PATH:/opt/myprogram/bin
If you want to have this path being set automatically, then follow this article.
Sort numerical value using the sort command
Answer:
Assume you have a text file contains the following content:
1
2
3
10When you use the sort command to sort them, it will give the following output:
# sort test.txt
1
10
2
3So you need to sort them according to the numerical values?
Try with the n flag:
# sort -n test.txt
1
2
3
10Revert uncommitted change in Git
Answer:
To revert the changes of a uncommitted file in Git, you need to use the following command:
# git checkout file
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
