Commands by Tephlon (1)

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Batch rename extension of all files in a folder, in the example from .txt to .md
Same thing using bash built-in features instead of a sub-shell.

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

remove the last of all html files in a directory
sed can be used deleting the last line and with -i option, there's no need to for temp files, the change is made on the actual file

Query Wikipedia via console over DNS
Shorter version, works with multiple words.

Transfer a file to multiple hosts over ssh
You can push files to up to 32 servers at once assuming ssh keys are in place. Great tool, it is part of the pssh suite.

Multiplication table
The multiplication table for math study

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

bash shell expansion
The expansion {,} in bash will repeat the given string once for each item seperated by commas. The given command will result in the following being run: cp /really/long/path/and/file/name /really/long/path/and/file/name-`date -I` These can be embedded as needed, ex: rm file{1,2,3{1,2,3}} would delete the files file1, file2, file31, file32, file32, and no other files.

backup with mysqldump a really big mysql database to a remote machine over ssh
backup big mysql db to remote machine over ssh. "--skip-opt" option is needed when you can?t allocate full database in ram.

New command with the last argument of the previous command.


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