Does tail read the whole file?
If I want to tail a 25 GB textfile, does the tail command read the whole file?
Unix & Linux
How can I numerically sort a single line of delimited items?
I have a line (or many lines) of numbers that are delimited by an arbitrary character. What UNIX tools can I use to sort each line’s items numerically, retaining the delimiter?
Correct location for piping and redirecting output in find -exec?
I’m using find with the -exec option in console, on FreeBSD (for example, find . -exec sha1 {} ;).
sponge from moreutils – what’s the difference to shell redirect? useful examples?
sponge reads standard input and writes it out to the specified file.
Unlike a shell redirect, sponge soaks up all its input before writing
the output file. This allows constructing pipelines that read from
and write to the same file.
Deleting billions of files from a directory while seeing the progress as well
I have a directory of 30 TB having billions of files in it which are formally all JPEG files. I am deleting each folder of files like this:
How do I force a user to change a password at the first time login using ssh?
I’m trying to force a newly created user to change a password at the first time login using ssh. For security reasons I want to give him a secure password until he logs in for the first time. I did the following so far:
How to get only files created after a date with ls?
With the ls command, is it possible to show only the files created after a specific date, hour…?
How to set power button to shutdown instead of suspend?
I am using GNOME 3.18.1 on Arch Linux 4.2.5-1-ARCH x86_64 on a Dell E6530 laptop. Since I installed this OS years ago, the power button on my laptop has always led my OS to completely power down.
Using “reserved” codes for exit status of shell scripts
I recently came across this list of Exit Codes With Special Meanings from the Advanced Bash-Scripting Guide. They refer to these codes as being reserved and recommend that: