How can I bury an invisible mark into random lines of text? Such a mark has to be there, though it will be invisible to someone reading that text printed out on the console. I want to identify those ...
I use the tail, head and grep commands to search log files. Most of the time the combination of these 3 commands, in addition to using pipe, gets the job done. However, I have this one log that many ...
The grep manual says "By default, grep prints the matching lines.". What does this matching lines says. When I tried its prints the whole paragraph containing the pattern.
I have a file that's growing about 200,000 lines a day, and it is all formed with blocks of three lines as such: 1358726575123 # key Joseph Brunner # name carpenter # job ...