Unix tricks - Useful but unusual
Here are a few Unix tricks you might not have seen before.
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pipe nightmares
So many people typecat file | grep Whatever
and I never really got it - why do all that extra typing when you could just say
grep Whatever file
???
and inefficient
If you do this in a shell script, you'll be repeatedly starting an extra process for no reason at all.habit
Old habits die hard.re: Pipe nightmare
Because, it's a consistency thing. In general you can do:a | grep b
so:
ls -l | grep donkey
make all | grep error
...
whatever
cat /var/log/system/whatever | grep pattern
it's just using the same pattern as is used every other time, that's all.
There is a reason...
It was a standard practice in the past. Now, it is just as acceptable for small operations, but against larger files, it takes much longer due to the processing of the ENTIRE file once by cat, then reprocessing the STDIN from the pipe to grep.If I am searching short phrases on the command line, I still cat | grep because it is easier to replace the end string than backing up past the filename. There is more than one way to do something in Unix/Linux, just understand the implications of each and use it wisely. Don't get wrapped around other peoples command line etiquite, sometimes there is a reason for their madness.
Unix Tricks
It just goes to show you that in Unix, there is more than one way to skin a "cat".When you start dog
When you start dog training, you need know how to train a puppy can use dog behavior training and dog training tips.Missing the "." (point)
The idea is not to "find" something in the file, rather to omit what you don't want. In this example the idea is to see everything that is 'not' a blank line.This is good stuff...
I have used the "grep ." command before and coincidentally, it was to eliminate some extraneous blank lines from a file that was creating issues with a poorly written file parser; the parser was choking on non-printable characters. I was using vi to check for those non-printables, but using cat is much simpler. Thanks...jobs for 14 year olds jobs
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