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Top Forums Shell Programming and Scripting Display runnning countdown in a bash script? Post 302281959 by Corona688 on Thursday 29th of January 2009 11:00:22 PM
Old 01-30-2009
This uses a few tricks to do what you want:
  • The printf command does NOT append a linefeed automatically unless you tell it to.
  • Setting IFS to something else lets the shell split things apart into arrays on whatever delimiter you want, in this case , :.
  • The date command can be used to produce time in seconds.
  • Carriage returns return the cursor to the beginning of the line without moving to the next line.

Code:
function countdown
{
        local OLD_IFS="${IFS}"
        IFS=":"
        local ARR=( $1 )
        local SECONDS=$((  (ARR[0] * 60 * 60) + (ARR[1] * 60) + ARR[2]  ))
        local START=$(date +%s)
        local END=$((START + SECONDS))
        local CUR=$START

        while [[ $CUR -lt $END ]]
        do
                CUR=$(date +%s)
                LEFT=$((END-CUR))

                printf "\r%02d:%02d:%02d" \
                        $((LEFT/3600)) $(( (LEFT/60)%60)) $((LEFT%60))

                sleep 1
        done
        IFS="${OLD_IFS}"
        echo "        "
}

countdown "00:07:55"

 

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GIT-ANNOTATE(1) 						    Git Manual							   GIT-ANNOTATE(1)

NAME
git-annotate - Annotate file lines with commit information SYNOPSIS
git annotate [options] file [revision] DESCRIPTION
Annotates each line in the given file with information from the commit which introduced the line. Optionally annotates from a given revision. The only difference between this command and git-blame(1) is that they use slightly different output formats, and this command exists only for backward compatibility to support existing scripts, and provide a more familiar command name for people coming from other SCM systems. OPTIONS
-b Show blank SHA-1 for boundary commits. This can also be controlled via the blame.blankboundary config option. --root Do not treat root commits as boundaries. This can also be controlled via the blame.showroot config option. --show-stats Include additional statistics at the end of blame output. -L <start>,<end> Annotate only the given line range. <start> and <end> can take one of these forms: o number If <start> or <end> is a number, it specifies an absolute line number (lines count from 1). o /regex/ This form will use the first line matching the given POSIX regex. If <end> is a regex, it will search starting at the line given by <start>. o +offset or -offset This is only valid for <end> and will specify a number of lines before or after the line given by <start>. -l Show long rev (Default: off). -t Show raw timestamp (Default: off). -S <revs-file> Use revisions from revs-file instead of calling git-rev-list(1). --reverse Walk history forward instead of backward. Instead of showing the revision in which a line appeared, this shows the last revision in which a line has existed. This requires a range of revision like START..END where the path to blame exists in START. -p, --porcelain Show in a format designed for machine consumption. --line-porcelain Show the porcelain format, but output commit information for each line, not just the first time a commit is referenced. Implies --porcelain. --incremental Show the result incrementally in a format designed for machine consumption. --encoding=<encoding> Specifies the encoding used to output author names and commit summaries. Setting it to none makes blame output unconverted data. For more information see the discussion about encoding in the git-log(1) manual page. --contents <file> When <rev> is not specified, the command annotates the changes starting backwards from the working tree copy. This flag makes the command pretend as if the working tree copy has the contents of the named file (specify - to make the command read from the standard input). --date <format> The value is one of the following alternatives: {relative,local,default,iso,rfc,short}. If --date is not provided, the value of the blame.date config variable is used. If the blame.date config variable is also not set, the iso format is used. For more information, See the discussion of the --date option at git-log(1). -M|<num>| Detect moved or copied lines within a file. When a commit moves or copies a block of lines (e.g. the original file has A and then B, and the commit changes it to B and then A), the traditional blame algorithm notices only half of the movement and typically blames the lines that were moved up (i.e. B) to the parent and assigns blame to the lines that were moved down (i.e. A) to the child commit. With this option, both groups of lines are blamed on the parent by running extra passes of inspection. <num> is optional but it is the lower bound on the number of alphanumeric characters that Git must detect as moving/copying within a file for it to associate those lines with the parent commit. The default value is 20. -C|<num>| In addition to -M, detect lines moved or copied from other files that were modified in the same commit. This is useful when you reorganize your program and move code around across files. When this option is given twice, the command additionally looks for copies from other files in the commit that creates the file. When this option is given three times, the command additionally looks for copies from other files in any commit. <num> is optional but it is the lower bound on the number of alphanumeric characters that Git must detect as moving/copying between files for it to associate those lines with the parent commit. And the default value is 40. If there are more than one -C options given, the <num> argument of the last -C will take effect. -h Show help message. SEE ALSO
git-blame(1) GIT
Part of the git(1) suite Git 1.8.3.1 06/10/2014 GIT-ANNOTATE(1)
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