{"id":2840,"date":"2020-12-23T11:14:56","date_gmt":"2020-12-23T19:14:56","guid":{"rendered":"https:\/\/SUMMALAI.COM\/?p=2840"},"modified":"2020-12-23T11:14:57","modified_gmt":"2020-12-23T19:14:57","slug":"linux-unix-bash-script-sleep-or-delay-a-specified-amount-of-time","status":"publish","type":"post","link":"https:\/\/SUMMALAI.COM\/?p=2840","title":{"rendered":"Linux \/ UNIX: Bash Script Sleep or Delay a Specified Amount of Time"},"content":{"rendered":"\n

Author:\u00a0Vivek Gite<\/p>\n\n\n\n

\"\"\/<\/figure>\n\n\n\n

<\/a>How do I pause for 5 seconds or 2 minutes in my bash shell script on a Linux or Unix-like systems?<\/p>\n\n\n\n

You need to use the sleep command to add delay for a specified amount of time. The syntax is as follows for gnu\/bash sleep command:
sleep NUMBER[SUFFIX]<\/kbd><\/p>\n\n\n\n

Where SUFFIX may be:<\/p>\n\n\n\n

  1. s<\/strong> for seconds (the default)<\/li>
  2. m<\/strong> for minutes.<\/li>
  3. h<\/strong> for hours.<\/li>
  4. d<\/strong> for days.<\/li><\/ol>\n\n\n\n

    Please note that the sleep command in BSD family of operating systems (such as FreeBSD) or macOS\/mac OS X does NOT take any suffix arguments (m\/h\/d). It only takes arguments in seconds. So syntax for sleep command for Unix<\/strong> like system is:
    sleep NUMBER<\/kbd><\/p>\n\n\n\n

    Examples<\/h2>\n\n\n\n
    ### To sleep for 5 days, use: ##<\/em>\nsleep<\/strong> 5d\n \n#####################################################################<\/em>\n# BSD\/Unix\/macOS implementations of sleep command have required that number <\/em>\n# be an integer, and only accepted a single argument without a suffix. <\/em>\n# However, GNU\/Linux version of sleep command accepts arbitrary floating <\/em>\n# point numbers.<\/em>\n#####################################################################<\/em>\n \n### To sleep for 1.5 seconds: ##<\/em>\nsleep<\/strong> 1.5\n \n## To sleep for .5 seconds: ###<\/em>\nsleep<\/strong> .5<\/pre>\n\n\n\n
    The most common usage are as follows:<\/p>\n\n\n\n
    ## run commmand1, sleep for 1 minute and finally run command2 ## <\/em>\ncommand1 &&<\/strong> sleep<\/strong> 1m &&<\/strong> command2\n \n## sleep in bash for loop ##<\/em>\nfor<\/strong> i in<\/strong> {<\/strong>1..10}<\/strong>\ndo<\/strong>\n  do_something_here\n  sleep<\/strong> 5s\ndone<\/strong>\n \n## run while loop to display date and hostname on screen ##<\/em>\nwhile<\/strong> [<\/strong> : ]<\/strong>\ndo<\/strong>\n    clear<\/strong>\n    tput cup 5 5\n    date<\/strong>\n    tput cup 6 5\n    echo<\/strong> \"Hostname : $(hostname)\"\n    sleep<\/strong> 1\ndone<\/strong><\/pre>\n\n\n\n
    Sample outputs from last while loop:
    <\/a><\/p>\n\n\n\n
    Animated gif.01: Sleep command in action<\/p>\n\n\n\n
    sleep Command Bash Script Example<\/h3>\n\n\n\n
    Here is a simple example:<\/p>\n\n\n\n
    #!\/bin\/bash<\/em>\necho<\/strong> \"Hi, I'm sleeping for 5 seconds...\"\nsleep<\/strong> 5  \necho<\/strong> \"all Done.\"<\/pre>\n\n\n\n
    ...\n...\nlockdir=`<\/strong>echo<\/strong> \"$cofile\" |<\/strong> sed<\/strong> -e 's|[\/\\\\:.-]|_|g'`<\/strong>.d\nwhile<\/strong> true<\/strong>; do<\/strong>\n  if<\/strong> mkdir<\/strong> \"$lockdir\" >\/<\/strong>dev\/<\/strong>null 2>&<\/strong>1; then<\/strong>\n    break<\/strong>\n  fi<\/strong>\n  sleep<\/strong> 1\ndone<\/strong>\n....\n..\n....<\/pre>\n\n\n\n
    How can I pause my bash shell script for 5 seconds before continuing?<\/h3>\n\n\n\n
    Use the read command:
    read -p \"text\" -t 5
    read -p \"Waiting five secs for Cloudflare to clear cache....\" -t 5
    echo \"Generating pdf file now ....\"<\/code>
    Sample outputs:
    Waiting five secs for Cloudflare to clear cache....
    Generating pdf file now ....<\/code>
    Where,<\/p>\n\n\n\n