The everlastingly useful grep command can change its character with the flip of a switch to help you find things. The grep command – likely one of the first ten commands that every Unix user comes to ...

grep is a command-line utility for searching plain-text data sets for lines that match a regular expression. Created in the early days of Unix, it has become a cornerstone of text processing in Linux ...

Wow. It’s amazing we ever made it out of the 20th century. It’s like reading about farmers who would plow by hand. I remember the epiphany (long time ago) of discovering how awk solved my problem of ...

The eval command allows you to run the contents of variables as commands and can be very useful, especially in scripts. There are probably a lot of Linux users who have never encountered the eval ...

A key point to these tools (from a practical point ) is that they are very memory efficient and allow work on just a "line".