.bash_profile and .bashrc are specific to bash, whereas .profile is read by many shells in the absence of their own shell-specific config files. (.profile was used by the original Bourne shell.) .bash_profile or .profile is read by login shells, along with .bashrc; subshells read only .bashrc. (Between job control and modern windowing systems, .bashrc by … Read more
I would use rsync as it means that if it is interrupted for any reason, then you can restart it easily with very little cost. And being rsync, it can even restart part way through a large file. As others mention, it can exclude files easily. The simplest way to preserve most things is to … Read more
There is now an official way to do this in rsync (version 3.1.0 protocol version 31, tested with Ubuntu Trusty 14.04). #> ./rsync -a –info=progress2 /usr . 305,002,533 80% 65.69MB/s 0:00:01 xfr#1653, ir-chk=1593/3594) I tried with my /usr folder because I wanted this feature for transferring whole filesystems, and /usr seemed to be a good … Read more
How to fix all of your crontab related woes/problems (Linux) This is a community wiki, if you notice anything incorrect with this answer or have additional information then please edit it. First, basic terminology: cron(8) is the daemon that executes scheduled commands. crontab(1) is the program used to modify user crontab(5) files. crontab(5) is a … Read more
When deciding what permissions to use, you need to know exactly who your users are and what they need. A webserver interacts with two types of user. Authenticated users have a user account on the server and can be provided with specific privileges. This usually includes system administrators, developers, and service accounts. They usually make … Read more
This is caused by a livelock when ntpd calls adjtimex(2) to tell the kernel to insert a leap second. See lkml posting http://lkml.indiana.edu/hypermail/linux/kernel/1203.1/04598.html Red Hat should also be updating their KB article as well. https://access.redhat.com/knowledge/articles/15145 UPDATE: Red Hat has a second KB article just for this issue here: https://access.redhat.com/knowledge/solutions/154713 – the previous article is for … Read more
Short answer: you can’t. Ports below 1024 can be opened only by root. As per comment – well, you can, using CAP_NET_BIND_SERVICE, but that approach, applied to java bin will make any java program to be run with this setting, which is undesirable, if not a security risk. The long answer: you can redirect connections … Read more
Hitting F1 or h will show you the key. But for reference, the default colors are: CPU: Blue = Low priority threads Green = Normal priority threads Red = Kernel threads Memory: Green = Used memory Blue = Buffers Yellow/Orange = Cache There are a couple of different color-schemes available, you can see them through … Read more
Yup, use -r: scp -rp sourcedirectory user@dest:/path -r means recursive -p preserves modification times, access times, and modes from the original file. Note: This creates the sourcedirectory inside /path thus the files will be in /path/sourcedirectory
As of GNU coreutils 7.5 released in August 2009, sort allows a -h parameter, which allows numeric suffixes of the kind produced by du -h: du -hs * | sort -h If you are using a sort that does not support -h, you can install GNU Coreutils. E.g. on an older Mac OS X: brew … Read more