Linux - NewbieThis Linux forum is for members that are new to Linux.
Just starting out and have a question?
If it is not in the man pages or the how-to's this is the place!
Welcome to LinuxQuestions.org, a friendly and active Linux Community.
You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today!
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in.
It will work, but it gets messy quickly. You can much more efficiently use a variable in memory (which is very fast) rather than writing to a disk (which is very slow). Whilst this difference in speed is negligible when you're only doing this once or twice, as soon as you start doing this thousands of times, this process really bogs everything down. Writing to a file also means you have to clean up after yourself, which can be a bit of a headache.
Variables were invented to avoid having to write to disk
Setting a variable does not emit any output, and "echo" doesn't need any input to get $var's value. Also, you aren't piping anything into wc. And lastly, commands separated by pipes are executed at the same time, not in sequence.