By Cooper M.
The complex Bash Scripting advisor is either a reference and an instructional on shell scripting. This finished 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 e-book additionally offers an advent to uncomplicated programming innovations, reminiscent of sorting and recursion. it's like minded for both person examine or lecture room use.
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Additional info for Advanced Bash-Scripting Guide. A complete guide to shell scripting
Let "1<2" returns 0 (as "1<2" expands to "1") (( 0 && 1 )) returns 1 (as "0 && 1" expands to "0") • An if can test any command, not just conditions enclosed within brackets. if cmp a b > /dev/null # Suppress output. " fi • An if/then construct can contain nested comparisons and tests. " if [[ $comparison = "integer" ]] then (( a < b )) else [[ $a < $b ]] fi then echo '$a is less than $b' fi Chapter 7. Tests 37 Advanced Bash−Scripting Guide This detailed "if−test" explanation courtesy of Stephane Chazelas.
With certain commands and utilities, such as echo and sed, escaping a character may have the opposite effect − it can toggle on a special meaning for that character. Special meanings of certain escaped characters used with echo and sed \n means newline Chapter 6. Quoting 32 Advanced Bash−Scripting Guide \r means return \t means tab \v means vertical tab \b means backspace \a means "alert" (beep or flash) \0xx translates to the octal ASCII equivalent of 0xx Example 6−2. sh: escaped characters echo; echo echo "\v\v\v\v" # Prints # Must use the −e option with echo −e "\v\v\v\v" # Prints echo −e "\042" # Prints \v\v\v\v 'echo' to print escaped characters.
Quoting 36 Chapter 7. Tests Every reasonably complete programming language can test for a condition, then act according to the result of the test. Bash has the test command, various bracket and parenthesis operators, and the if/then construct. 1. Test Constructs • An if/then construct tests whether the exit status of a list of commands is 0 (since 0 means "success" by UNIX convention), and if so, executes one or more commands. • There exists a dedicated command called [ (left bracket special character).