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list files recursively by size

Sort specific lines while editing within vi
Sort lines within vi editor. In this example sort lines 33-61 and lines 4-9 asciibetically.

Combine cssh and shell expansion to execute commands on a large cluster
This will open an awful lot of little windows, but is quite useful if you want to quickly patch something on a cluster of servers.

See system users

check web server port 80 response header

File rotation without rename command
Rotates log files with "gz"-extension in a directory for 7 days and enumerates the number in file name. i.e.: logfile.1.gz > logfile.2.gz I needed this line due to the limitations on AIX Unix systems which do not ship with the rename command.

Show all mergeinfo for a svn subtree

Erase CD RW

dd with progress bar and statistics
This command utilizes 'pv' to show dd's progress. Notes on use with dd: -- dd block size (bs=...) is a widely debated command-line switch and should usually be between 1024 and 4096. You won't see much performance improvements beyond 4096, but regardless of the block size, dd will transfer every bit of data. -- pv's switch, '-s' should be as close to the size of the data source as possible. -- dd's out file, 'of=...' can be anything as the data within that file are the same regardless of the filename / extension.

Find common groups between two users


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