UNIX/Linux Shell CheatSheet : free A4
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I am often asked to recommend "real" books on the subject of shell scripting. It is not a request that I find easy to answer; I have yet to read a dead-tree book on the subject which really stands out.
However, I do understand the need for physical copies of books ( though a $9.99 ebook is always a good idea!):
| £4.99 | €6.99 | $9.99 |
In the mean time, here are some suggestions:
Strictly speaking, this is offtopic, but every UNIX guru needs to own K&R's C book.

My blog has tips about how to use Unix and Linux commands