Ping machine once, waiting 1 second for response until failing. Upon fail, ssh globally, otherwise ssh locally.

Returns the pathnames of the files which would be executed in the current environment had its arguments been given as a command.

Variant of find grep that ignores files with .svn in the name. Useful for searching through a local repository of source code.

Replace and accordingly.

bash/ksh subshell redirection (as file descriptors) used as input to diff

Good for one off jobs that you want to run at a quiet time. The default threshold is a load average of 0.8 but this can be set using atrun. Show Sample Output

Useful in scripts when the file is passed in as an argument. Eg. filepath=$(realpath $1) Show Sample Output

Useful for checking if there are differences between local and remote files.

This decompresses the file and sends the output to STDOUT so it can be grepped. A good one to put in loops for searching directories of gzipped files, such as man pages. Show Sample Output

Useful for getting to know the available keyboard shortcuts. Show Sample Output

sometimes you got conflicts using SSH (host changing ip, ip now belongs to a different machine) and you need to edit the file and remove the offending line from known_hosts. this does it much easier. Show Sample Output

This is useful for keeping an eye on an error log while developing. The !^ pulls the first arg from the previous command (which needs to be run in a sub-shell for this shortcut to work).

This appends (-A) a new rule to the INPUT chain, which specifies to drop all packets from a source (-s) IP address.

Self-referential use of wget. Show Sample Output

great for outputting tweets from cron jobs and batch scripts Show Sample Output

Changes standard mysql client output to 'less'. In another words makes query results of mysql command line client to look much better.

it compresses the files and folders to stdout, secure copies it to the server's stdin and runs tar there to extract the input and output to whatever destination using -C. if you emit "-C /destination", it will extract it to the home folder of the user, much like `scp file [email protected]:`. the "v" in the tar command can be removed for no verbosity.

checks which files are not under version control, fetches the names and runs them through "svn add". WARNING: doesn't work with white spaces.