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When was your OS installed?
shows also time if its the same year or shows year if installed before actual year and also works if /etc is a link (mac os)

Synchronize both your system clock and hardware clock and calculate/adjust time drift
Do not run this command if you already have ntpd running! This needs to run as root, for example with sudo: $ sudo ntpdate pool.ntp.org && sudo hwclock --systohc && sudo hwclock --adjust This command will fetch accurate time from NTP servers and synchronize your system clock, then it will use the system clock to synchronize your hardware clock, and will calculate the time drift.

shuffle lines via perl
Same, without modules... Probably smarter option: just use the shuf command or even sort -R.

shell bash iterate number range with for loop
Bash's arithmetic evaluation.

Alternative size (human readable) of files and directories (biggest last)
using mb it's still readable;) a symbol variation $ du -ms {,.[^.]}* | sort -nk1

Display the inodes number of /

Display email addresses that have been sent to by a postfix server since the last mail log rollover
This assumes your mail log is /var/log/mail.log

Use Linux coding style in C program
put "-linux" option into $HOME/.indent.pro to make it default

graphical memory usage
smem is very clever, it keeps in mind shared memory in its calculations!!! http://www.selenic.com/smem/


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