By Mauny M.
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Extra info for Functional Programming Using Calm Light
Echo; echo escape=$'\033' # 033 is octal for escape. echo "\"escape\" echoes as $escape" # no visible output. echo; echo exit 0 See Example 34−1 for another example of the $' ' string expansion construct. " # Hello # "Hello", he said. \$ gives the dollar sign its literal meaning (variable name following \$ will not be referenced) echo "\$variable01" # results in $variable01 \\ gives the backslash its literal meaning echo "\\" # Results in \ # Whereas . . echo "\" # Invokes secondary prompt from the command line.
Special meanings of certain escaped characters used with echo and sed \n means newline \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 5−2. sh: escaped characters echo; echo echo "\v\v\v\v" # Prints \v\v\v\v literally. # 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).
A successful command returns a 0, while an unsuccessful one returns a non−zero value that usually may be interpreted as an error code. Well−behaved UNIX commands, programs, and utilities return a 0 exit code upon successful completion, though there are some exceptions. Likewise, functions within a script and the script itself return an exit status. The last command executed in the function or script determines the exit status. Within a script, an exit nnn command may be used to deliver an nnn exit status to the shell (nnn must be a decimal number in the 0 − 255 range).