Advanced Bash-Scripting Guide. A complete guide to shell by Cooper M.

By Cooper M.

The complicated Bash Scripting advisor is either a reference and an educational on shell scripting. This accomplished e-book (the identical of approximately 646 print pages) covers virtually each point of shell scripting. It comprises over three hundred profusely commented illustrative examples, and a couple of tables. not only a shell scripting instructional, this booklet additionally presents an creation to simple programming options, equivalent to sorting and recursion. it's like minded for both person research or school room use.

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Example text

B" ] This operator uses pattern matching within a [[ ... ]] construct. 3. Comparison operators (binary) 46 Advanced Bash−Scripting Guide if [ "$a" \< "$b" ] Note that the "<" needs to be escaped within a [ ] construct. > is greater than, in ASCII alphabetical order if [[ "$a" > "$b" ]] if [ "$a" \> "$b" ] Note that the ">" needs to be escaped within a [ ] construct. See Example 26−4 for an application of this comparison operator. −z string is "null", that is, has zero length −n string is not "null".

2. 3. 4. 5. 2. 6. 7. The Double Parentheses Construct 10. 1. 2. 3. 4. Testing and Branching 11. 1. Job Control Commands 12. 1. 2. 3. 4. 5. 6. 7. 8. 9. Miscellaneous Commands 13. System and Administrative Commands 14. Command Substitution 15. Arithmetic Expansion 16. 1. 2. 3. Applications 17. Here Documents 18. 2.

Therefore, in a Bash script, test does not call the external /usr/bin/test binary, which is part of the sh−utils package. Likewise, [ does not call /usr/bin/[, which is linked to /usr/bin/test. bash$ type test test is a shell builtin bash$ type '[' [ is a shell builtin bash$ type '[[' [[ is a shell keyword bash$ type ']]' ]] is a shell keyword bash$ type ']' bash: type: ]: not found Example 7−2. " fi if [ −z "$1" ] # Functionally identical to above code block. # if [ −z "$1" should work, but...

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