Still, the purge command, in the right circumstances, can be a useful trick for helping to give your Mac that second wind it sometimes needs!įollow Apple Hacks over on Facebook and Twitter, or Gadget Hacks over on Facebook, Google+, and Twitter, for more Apple fun. Also, as declared before, Terminal is a powerful tool, so if you're not comfortable working with the command line, then you should perhaps avoid using this for now. For example, if for whatever reason you need to empty out everything in the RAM and disk caches, then you should restart. For example, if you're doing video editing with only 4 GB of RAM, then upgrading your current setup so that you have more RAM available would make more sense rather than continually using the purge command. Naturally, the purge command is not a substitute for more RAM. However, OS X in more recent years has definitely become a lot smarter with memory management, which should cover a lot of usage scenarios. The most prominent benefit of the purge command is to flush out the used up RAM and disk cache contents to improve system performance. The purge command can be useful, however, it has some limitations. You can change the app icon too if you want. It will save as an Automator application that you can place wherever you want. To make an app that you can click on from your Dock, or wherever, open a new file in Automator, select "Application," and do the same exact thing as above. You can find it in your Utilities folder in Applications, in your Launchpad, or via Spotlight Search. Terminal is a program that lets you to carry out command line operations launch it to begin.
To remedy this, you can force your Mac to clear out the RAM and disk caches without rebooting, which can be very useful if you want to give your system performance a "boost" without restarting. Sometimes the RAM and disk caches are not emptied properly, even though they were supposed to (like when you quit a running program), and this can lead to issues. OS X does a quite decent job of memory management, but it's not perfect. OS X is responsible for memory management (unloading RAM and disk cache contents), and proper memory management is crucial in ensuring your machine is running smoothly. When you run programs and do other activities on your computer, content of different sorts gets loaded into the RAM and disk caches, and when you quit a running program, all that loaded content should be purged from memory. I have prepared the below script to find the filesystem which is 100% full and then remove directories from the given path.If you've been around computers long enough, you've probably heard the phrase " have you tried turning it off and on again?" This trick usually works because it forces your computer to empty out the contents of its RAM and disk caches when you restart. Mail -s "Alert: $(hostname) almost out of disk space $usep%" $ADMIN To improve the error reporting you could also add the hostname to the subject line To remove all lines not starting with a / which would also remove mounted network shares (sshfs, nfs etc.)Īdditionally you could change the df command toĪnother problem arises from the use of “sh” instead of bash – None 9,9G 3,3G 6,1G 35% /var/lib/ureadahead/debugfs – it won’t work with non english output from dfĭateisystem Size Used Avail Use% Eingehängt auf $ df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk ' So how do you filter out the results? use the grep command or egerp command as follows: For example, NFS mounted or CD/DVD ROM or loopback devices. Step # 2: Next filter out filesystem and find out the percentage of space
The -H option show sizes in powers of 1000 as follows:įilesystem Size Used Avail Use% Mounted on Open the terminal application and type the df command (no need to use the du command):
(c) Write a shell script to watch the disk space and send an email. (b) Then filter out filesystem and find out the percentage of space using the grep command or egrep command. (a) First, find disk space usage using the df command. Linux shell script to send an alert email if disk usage exceeds 90%
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