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88 lines
1.9 KiB
Bash
88 lines
1.9 KiB
Bash
#!/bin/bash
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# Using two digits the represent the value being counted down
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# Two-digits set in decimal representation used by printf
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# Usage: 'countdown #delay #style'
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# Delay is an integer from 1 to 99 (what happens if zero?)
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# Style is a string, either "numbers" or "style"
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# Arguments should always be given in that order
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# Both arguments may be omitted, in that case delay defaults to ten seconds and style to "numbers"
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defaultdelay=10
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numberstyle="numbers"
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symbolstyle="symbols"
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defaultstyle=$numberstyle
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if [ $# -gt 2 ]; then
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# More than two arguments
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echo Too many arguments
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exit
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else
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# Two or less arguments
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if [ $# -eq 2 ]; then
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# Exactly two arguments
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# First argument should specify the delay
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delaysecs=$1
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# Second argument should specify the display style
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style=$2
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else
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if [ $# -eq 1 ]; then
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# Only one argument
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# Argument specifies the delay
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delaysecs=$1
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# Style defaults to "numbers"
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style="numbers"
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else
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# No arguments submitted
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# Delay defaults
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delaysecs=$defaultdelay
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# Style defaults
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style=$defaultstyle
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fi
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fi
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fi
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# Adjustment by one second
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#delaysecs=$[$delaysecs-1]
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delaystatic=$delaysecs
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if [ $style == $numberstyle ]; then
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while [ $delaysecs -gt 0 ]
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do
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sleep 1 &
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printf "\r"
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# Text before counter
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printf "Stand by... "
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printf "%02d" $[delaysecs]
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delaysecs=$[$delaysecs-1]
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wait
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done
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# Printing the zero (end of count-down)
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printf "\b\b"
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printf "%02d" $[delaysecs]
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printf " - Done!"
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echo
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else
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# style is symbolstyle
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printf -v line '%*s' "$delaysecs"
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printf "%s\r" "${line// /#}"
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while [ $delaysecs -gt 0 ]
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do
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sleep 1 &
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printf "+"
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delaysecs=$[$delaysecs-1]
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wait
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done
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#printf "\b "
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echo
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fi
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# Bash quoting with ANSI-C style
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# \b - backspace
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# \r - carriage return
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# \n - newline
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# \f - form-feed
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# \t - horizontal tabulator
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# \v - vertical tabulator
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# http://bash-hackers.org/wiki/doku.php/commands/builtin/printf
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