Watch A Useful Linux Command You May Have Never Heard Of.Updated November 9th, 2.How many times did I want to watch a directory waiting for a file to appear in it Constant ls, for example, quickly got boring.A quick Perl script that would reload ls every 5 seconds yeah it works but it takes a while to type up, and often enough Im too lazy for that.And then I found watch a utility that comes with most nix distros.Look at this beauty man watch NAME watch execute a program periodically, showing output fullscreen.SYNOPSISwatch dhvt n differencescumulative helpinterval no title versionDESCRIPTIONwatch runs command repeatedly, displaying its output the first screenfull.This allows you to watch the program output change over time.By default, the program is run every 2 seconds use n or interval tospecify a different interval.The d or differences flag will highlight the differences betweensuccessive updates.The cumulative option makes highlightingsticky, presenting a running display of all positions that have everchanged.The t or no title option turns off the header showing theinterval, command, and current time at the top of the display, as wellas the following blank line.NOTENote that command is given to sh c which means that you may need touse extra quoting to get the desired effect.Note that POSIX option processing is used i.This means that flags aftercommand dont get interpreted by watch itself.EXAMPLESTo watch for mail, you might do.To watch the contents of a directory change, you could use.If youre only interested in files owned by user joe, you might usewatch d ls l fgrep joewatch d ls l fgrep joeTo see the effects of quoting, try these outwatch echo.You can watch for your administrator to install the latest kernel withJust kidding.Now if anyone knows how to make watch print the bottom part of the command output rather than the top, please post a comment.Edit BSD users, watch out. Corporate Finance A Practical Approach Cfa Downloads . This page provides information about the Linux curl command and why you would use it over the wget command.Curl Command To Resume Download' title='Curl Command To Resume Download' />BSD it lets you snoop on other users ttys.The corresponding BSD command is actually cmdwatch.Artem Russakovskii is a San Francisco programmer, blogger, and future millionaire that last part is in the works.Follow Artem on Twitter Artem.The wget command can be used to download files using the Linux and Windows command lines.CURL kl or kl is a computer software project providing a library and commandline tool for transferring data using various protocols.The cURL project.R or subscribe to the RSS feed.In the meantime, if you found this article useful, feel free to buy me a cup of coffee below.
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