"-o loop" lets you use a file as a block device
Credit goes here: http://blag.xkcd.com/2008/12/03/some-lists/ Show Sample Output
...can do similar w/ tar, dd, xfsdump, e2fsdump, etc.
e.g. fuser 25/tcp (see which pid is listening on smtp)
The two lines below are for a BeanShell script so it can be executed under Linux and Cygwin. Also, bsh.jar must be in the CLASSPATH environment variable, or in the jre/lib/ext/ directory of the JVM. #! /bin/sh ///bin/true; exec java bsh.Interpreter "$0" "$@"
Does an 'ls' on just the files and directories in the current directory with an execute bit turned on. This version will list directories. Just tack on "-type f" to the start of the find to omit listing directories and list only files.
Substitute nano with your favorite editor, of course.
Or "tail -r" on Solaris.
a pkcs8 key will have integer 00 at offset 4 and an rsaEncryption object at offset 9
This command will start a simple SMTP server listening on port 1025 of localhost. This server simply prints to standard output all email headers and the email body.
changes group ownership of all files/dirs in /path/to/dir to a project group [projgroup] and then gives the sgid bit to directories in that tree - all subsequently created files will inherit [projgroup]'s gid.
useful if you want to start running a svc as a non-privileged user instead of root.
This comes in handy for me when I am developing and testing Perl command line scripts. http://technet.microsoft.com/en-us/library/bb490880.aspx
Use this as a quick and simple alternative to the slightly verbose "du -s --max-depth=1" Show Sample Output
Easily convert units of similar measurement. May also be invoked alone, units. Show Sample Output
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