Download Advanced Bash-Scripting Guide by Mendel Cooper PDF

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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Quoting # Splits the variable in parts at whitespace. 39 Advanced Bash-Scripting Guide do echo "$a" done # one # two # three echo "---" for a in "$List" do # ^ ^ echo "$a" done # one two three # Preserves whitespace in a single variable. A more elaborate example: variable1="a variable containing five words" COMMAND This is $variable1 # Executes COMMAND with 7 arguments: # "This" "is" "a" "variable" "containing" "five" "words" COMMAND "This is $variable1" # Executes COMMAND with 1 argument: # "This is a variable containing five words" variable2="" # Empty.

Echo $'\t \042 \t' # Quote (") framed by tabs. # It also works with hexadecimal values, in an $'\xhhh' construct. echo $'\t \x22 \t' # Quote (") framed by tabs. # Thank you, Greg Keraunen, for pointing this out. # Earlier Bash versions allowed '\x022'. echo "===============" echo # Assigning ASCII characters to a variable. # ---------------------------------------quote=$'\042' # " assigned to a variable. " echo # Concatenating ASCII chars in a variable. triple_underline=$'\137\137\137' # 137 is octal ASCII code for '_'.

Ls -l /usr/X11R6/bin/xsetroot\ /sbin/dump\ $file_list Chapter 5. Quoting 44 Advanced Bash-Scripting Guide # Error: the first three files concatenated into a single argument to 'ls -l' # because the two escaped spaces prevent argument (word) splitting. The escape also provides a means of writing a multi-line command. Normally, each separate line constitutes a different command, but an escape at the end of a line escapes the newline character, and the command sequence continues on to the next line.

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