It was also surprising because, among the numerous tiny and previously unseen files, a great many returned a hit for the simple pattern "one." However, such unforeseen output is a learning experience that increases my knowledge of how systems work. I was surprised at the fact that the diligent grep hunted down hidden files deep into the dark depths of my subdirectories (those files beginning with a dot) but also at how many subdirectories my Ubuntu desktop needed to operate. The screeds of output from this command might alarm some users executing it on desktops. According to the man page, you can use either the upper- or lowercase version of -r to search recursively through subdirectories and receive the same result: # grep -r one /home/chris With the malleable grep command, it's possible to look through subdirectories, too. The details displayed by the program it spawns is actually a viewer converting compressed content from the file /usr/share/info/ – thanks to the functionality of grep and less. For example, when you run the command, # info grep Many of the instruction manuals, or info pages, bundled with Unix-like operating systems are compressed to save space.
#MACON LITTLE THEATRE HAYNIE BRISTOL WINDOWS#
Now I'll dismiss the compression format more commonly associated with Windows operating systems for a moment and doff my cap at files compressed with gzip.
#MACON LITTLE THEATRE HAYNIE BRISTOL ZIP#
Using that file, I'll start with a simple grep example that searches for a pattern within a file: # grep one filenameįigure 5: Zgrep is clever enough to delve inside a ZIP file. To get moving in the right direction, I'll consider a text file with five lines of words ( Figure 1, top). First, I want to get my hands dirty with a reminder of some of the basics. The stalwart that is grep comes to a command prompt near you in a few forms, but I'll come to that a little later. With grep you can rifle through just one file, all of a directory, the process table, and much more without batting an eyelid. Not Such a Bad PilotĪs most sys admins soon discover, one of the heroes of the Linux command line is the grep command. Therefore, in this article, I will dig into some of the history of grep and attempt to help you improve your readily available knowledge, with the aim of being able to solve problems more efficiently and quickly. When I typed history at the prompt, lo and behold, that old favorite grep stood out as something I use continually throughout my working day. To increase my efficiency in creating command lines and scripts, I made a conscious decision to start again and effectively go back to basics with some of the core shell commands that is, I wanted a timely way to improve my understanding of a few key packages so that I wasn't always looking up a parameter or switch and, thus, speed up my ability to automate tasks. In the end, I concluded that clever little command lines were the way forward, and in most cases, these could translate into clever little shell scripts. When I recently spent some time away from the computer monitor, I had a chance to consider what I could use to help automate tasks and to think about the procedures that I face routinely. I have had many a moment in which I lucidly caught myself thinking: "Not this task again! I really need to speed this process up." By simply automating a procedure or ultimately deprecating and condemning it as redundant, I could save a lot of time in the long run.
We are all creatures of habit in varying degrees, and I frequently find myself settling into various routines in my job as a sys admin.
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