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A fictitious (literally, it's not a real book) book about mastering the UNIX/Linux 'cat' command. "Written" by Shlomi Fish, the acclaimed author of 'Mastering rm', and 'Mastering mv'.
O'Reilly Net: Hi Shlomi!
Shlomi Fish: Hi!
O'Reilly Net: So, what has motivated you to write the book?
Shlomi Fish: Well, I realised people use cat so often that they don't take the time to fully investigate it and learn it. For example, many people I worked with believed that cat can only be used to output one file at a time. So to output several files they used something like:
(cat file1.txt ; cat file2.txt ; cat file3.txt) | command
The horror! cat accepts several files as arguments. So you can write it as:
cat file1.txt file2.txt file3.txt | command
This has motivated me to write the book, to make people fully understand the command.
O'Reilly Net: Isn't mastering cat supposed to be quite easy? Does it really necessitates its own book?
Shlomi Fish: Hell no! Mastering cat is not easy at all. In fact, mastering cat is almost as difficult as herding cats.
For example, one case where I found that people truly underestimate the power of cat is in the prefixing a line example. You can do that with:
echo "This would be the first line" | cat - myfile.txt > myfile.txt.new
mv -f myfile.txt.new myfile.txt
But people do not realize that and instead opted to use sed, awk, or even perl (!). It can be taken further, of course. If the prefix is already in its own file, you can simply use cat prefix.txt myfile.txt
Of course, if you want to append the same text to both the start and the end of a file, you can't do that with cat - myfile.txt -. It simply doesn't work that way. So, I end up explaining a lot about UNIX pipeline concepts in the book.
O'Reilly Net: So what else does your book cover?
Well, I cover many things there. Among them are:
1. History of the cat command.
2. Differences between the various cat implementations. (GNU, the BSDs, System V, etc.)
3. cat equivalents in other operating systems (DOS, Win32, VMS, OS/390, etc.)
4. Overview of the GNU cat codebase (for programmers).
I'm also focusing on the various cat flags, which aid in its interactive use. For example the -E/--show-ends flag, that places dollar signs at the end of the lines.
Except for that I'm also covering dog which is a program that provides a superset of the cat program. I should also mention mouse which aimed to provide an even greater superset, and was never released. Rumors say some parts of it are based on code of the leaked Windows 2000 sources.
O'Reilly Net: Your book seems bound to be popular. (for some values of popularity) What can we expect from you next?
Shlomi Fish: Well, I hope many people will buy the book, or read it online so they'll be educated about cat. If you like "Mastering cat", look forward to my next book - "Mastering echo". I expect it to be published next fall.
Shlomi Fish: Hi!
O'Reilly Net: So, what has motivated you to write the book?
Shlomi Fish: Well, I realised people use cat so often that they don't take the time to fully investigate it and learn it. For example, many people I worked with believed that cat can only be used to output one file at a time. So to output several files they used something like:
(cat file1.txt ; cat file2.txt ; cat file3.txt) | command
The horror! cat accepts several files as arguments. So you can write it as:
cat file1.txt file2.txt file3.txt | command
This has motivated me to write the book, to make people fully understand the command.
O'Reilly Net: Isn't mastering cat supposed to be quite easy? Does it really necessitates its own book?
Shlomi Fish: Hell no! Mastering cat is not easy at all. In fact, mastering cat is almost as difficult as herding cats.
For example, one case where I found that people truly underestimate the power of cat is in the prefixing a line example. You can do that with:
echo "This would be the first line" | cat - myfile.txt > myfile.txt.new
mv -f myfile.txt.new myfile.txt
But people do not realize that and instead opted to use sed, awk, or even perl (!). It can be taken further, of course. If the prefix is already in its own file, you can simply use cat prefix.txt myfile.txt
Of course, if you want to append the same text to both the start and the end of a file, you can't do that with cat - myfile.txt -. It simply doesn't work that way. So, I end up explaining a lot about UNIX pipeline concepts in the book.
O'Reilly Net: So what else does your book cover?
Well, I cover many things there. Among them are:
1. History of the cat command.
2. Differences between the various cat implementations. (GNU, the BSDs, System V, etc.)
3. cat equivalents in other operating systems (DOS, Win32, VMS, OS/390, etc.)
4. Overview of the GNU cat codebase (for programmers).
I'm also focusing on the various cat flags, which aid in its interactive use. For example the -E/--show-ends flag, that places dollar signs at the end of the lines.
Except for that I'm also covering dog which is a program that provides a superset of the cat program. I should also mention mouse which aimed to provide an even greater superset, and was never released. Rumors say some parts of it are based on code of the leaked Windows 2000 sources.
O'Reilly Net: Your book seems bound to be popular. (for some values of popularity) What can we expect from you next?
Shlomi Fish: Well, I hope many people will buy the book, or read it online so they'll be educated about cat. If you like "Mastering cat", look forward to my next book - "Mastering echo". I expect it to be published next fall.
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