Download e-book for iPad: Advanced bash-scripting guide by Mendel Cooper

By Mendel Cooper

This can be the whole reference at the Borne back shell (bash). quantity 1Volume 2 comprises all appendices.

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In a regular expression, a "^" addresses the beginning of a line of text. ^, ^^ Uppercase conversion in parameter substitution (added in version 4 of Bash). Control Characters change the behavior of the terminal or text display. A control character is a CONTROL + key combination (pressed simultaneously). A control character may also be written in octal or hexadecimal notation, following an escape. Control characters are not normally useful inside a script. ◊ Ctl-A Moves cursor to beginning of line of text (on the command-line).

If variable1 is the name of a variable, then $variable1 is a reference to its value, the data item it contains. [1] bash$ variable1=23 bash$ echo variable1 variable1 bash$ echo $variable1 23 The only time a variable appears "naked" -- without the $ prefix -- is when declared or assigned, when unset, when exported, or in the special case of a variable representing a signal (see Example 31-5). Assignment may be with an = (as in var1=27), in a read statement, and at the head of a loop (for var2 in 1 2 3).

1 : ${username=`whoami`} 2 # ${username=`whoami`} 3 # Gives an error without the leading : unless "username" is a command or builtin... Provide a placeholder where a command is expected in a here document. See Example 19-10. Evaluate string of variables using parameter substitution (as in Example 10-7). } 2 # Prints error message 3 #+ if one or more of essential environmental variables not set. Variable expansion / substring replacement. In combination with the > redirection operator, truncates a file to zero length, without changing its permissions.

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Advanced bash-scripting guide by Mendel Cooper

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