Advanced Bash-Scripting Guide by Mendel Cooper

By Mendel Cooper

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

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By Mendel Cooper

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

Show description

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As Lee Maschmeyer explains: # -------------------------# In the [first vertical tab example] . . the vertical tab #+ makes the printing go straight down without a carriage return. " # The real purpose of VT is to go straight UP, not down. # It can be used to print superscripts on a printer. # The col utility can be used to emulate the proper behavior of VT. exit 0 ◊ Ctl-N Chapter 3. Special Characters 25 Advanced Bash-Scripting Guide Erases a line of text recalled from history buffer [20] (on the command-line).

Gives the backslash its literal meaning echo "\\" # Results in \ # Whereas . . echo "\" # Invokes secondary prompt from the command line. # In a script, gives an error message. # However . . echo '\' # Results in \ The behavior of \ depends on whether it is escaped, strong-quoted, weak-quoted, or appearing within command substitution or a here document. echo echo echo echo echo echo \z \\z '\z' '\\z' "\z" "\\z" echo echo echo echo echo echo echo echo `echo `echo `echo `echo `echo `echo `echo `echo \z` \\z` \\\z` \\\\z` \\\\\\z` \\\\\\\z` "\z"` "\\z"` Chapter 5.

Use the -e option with 'echo' to print escaped characters. echo "=============" echo "VERTICAL TABS" echo -e "\v\v\v\v" # Prints 4 vertical tabs. echo "==============" echo "QUOTATION MARK" echo -e "\042" # Prints " (quote, octal ASCII character 42). echo "==============" # The $'\X' construct makes the -e option unnecessary. echo; echo "NEWLINE AND BEEP" echo $'\n' # Newline. echo $'\a' # Alert (beep). echo "===============" echo "QUOTATION MARKS" # Version 2 and later of Bash permits using the $'\nnn' construct.

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