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List top 10 files in filesystem or mount point bigger than 200MB
Specify the size in bytes using the 'c' option for the -size flag. The + sign reads as "bigger than". Then execute du on the list; sort in reverse mode and show the first 10 occurrences.

Resolve a list of domain names to IP addresses
Given a file of FQDN, this simple command resolves the IP addresses of those Useful for log files or anything else that outputs domain names.

Monitor a file with tail with timestamps added
Should be a bit more portable since echo -e/n and date's -Ins are not.

Print interface that is up and running

Top 10 Memory Processes
It displays the top 10 processes sorted by memory usage

Comparison between the execution output of the last and penultimate command
Useful for checking if there are differences between last and penultimate command.

Simple word scramble
enlubtsqyuse $ cat /tmp/out subsequently

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.

move you up one directory quickly
Alias a single character 'b' to move to parent directory. Put it into your .bashrc or .profile file. Using "cd .." is one of the most repetitive sequence of characters you'll in the command line. Bring it down to two keys 'b' and 'enter'. It stands for "back" Also useful to have multiple: alias b='cd ../' alias bb='cd ../../' alias bbb='cd ../../../' alias bbbb='cd ../../../../'

Remove a range of lines from a file


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