Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.
Change user's timezone setting
Answer:
User can have their own timezone setting.
1. Firstly, you need to find out the timezone string by selecting interactively using the command tzselect command.
2. Append the string to the file ~/.profile
E.g.
# echo " TZ='Asia/Hong_Kong'; export TZ" >> ~/.profile
Disable auto /tmp folder clean up when reboot in Debian/Ubuntu
Answer:
In Debian/Ubuntu, the /tmp folder will be auto cleaned up when computer reboot.
To disable this function, do the thing below:
# sudo vim /etc/default/rcS
Change from:
TMPTIME=0
To:
TMPTIME=1
That's all.
How do I find and replace non-printable characters in vim?
Answer:
To replace non-printable characters in vim, e.g. get rid of ^M, you need to use the following replace method.
:%s/^M//g
Notes: The ^M above was inputted by holding down "Ctrl+v+m" at the same time.
Compress and decompress file using 7zip
Answer:
7zip is a well known compression program if you need a very small file size, i.e. high compression ratio.
To install under Ubuntu/Debian:
# sudo apt-get install p7zip
To compress a file
# p7zip test.txt
To decompress a file
# p7zip -d test.txt.7z
Output the last N bytes of a file in Linux
Answer:
In previous article, we have shows how to print the first N bytes of a file in Linux. But how to print the last N bytes of a file instead?
Solution:
# tail --byte 4 input.txt
...
The above command print the last 4 bytes of the file input.txt
