By Mendel Cooper
This record is either an instructional and a reference on shell scripting with Bash. It assumes no earlier wisdom of scripting or programming, yet progresses swiftly towards an intermediate/advanced point of guide. The routines and heavily-commented examples invite energetic reader participation. nonetheless, it's a paintings in growth. The goal is so as to add a lot supplementary fabric in destiny updates to this record, because it evolves right into a accomplished ebook that fits or surpasses any of the shell scripting manuals in print.
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Extra info for Advanced bash-scripting guide
Echo $'\n' echo $'\a' echo $'\t \042 \t' # Quote (") framed by tabs. # Assigning ASCII characters to a variable. # −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− quote=$'\042' # " assigned to a variable. " echo # Concatenating ASCII chars in a variable. triple_underline=$'\137\137\137' # 137 is octal ASCII code for "_". echo "$triple_underline UNDERLINE $triple_underline" ABC=$'\101\102\103\010' echo $ABC Chapter 6. Quoting # 101, 102, 103 are octal A, B, C. 33 Advanced Bash−Scripting Guide echo; echo escape=$'\033' # 033 is octal for escape.
There exists a dedicated command called [ (left bracket special character). It is a synonym for test, and a builtin for efficiency reasons. This command considers its arguments as comparison expressions or file tests and returns an exit status corresponding to the result of the comparison (0 for true, 1 for false). 02, Bash introduced the [[ ... ]] extended test command, which performs comparisons in a manner more familiar to programmers from other languages. Note that [[ is a keyword, not a command.
Chapter 6. Quoting 35 Advanced Bash−Scripting Guide #foobar echo echo 'foo\ bar' # Escape character \ taken literally because of strong quoting. #foor\ #bar # Examples suggested by Stephane Chazelas. Chapter 6. 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.
Advanced bash-scripting guide by Mendel Cooper