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BourneShell: Go to previous directory
cd - would return to the previous directory of your cd command. NB: previous dir is always stored in $OLDPWD variable.

list block devices
Shows all block devices in a tree with descruptions of what they are.

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.

Remove old unused kernels from Red Hat Enterprise Linux 5 & Fedora 12/13
Install using yum install yum-utils Options include: --oldkernels Remove old kernel and kernel-devel packages --count=KERNELCOUNT Number of kernel packages to keep on the system (default 2) use package-cleanup --help for a complete list

Update twitter with Perl
Requires Net::Twitter. Just replace the double quoted strings with the appropriate info.

GIT: list unpushed commits

Test a serial connection
If the connection works you should see a "hello" on host A. If not: check your cabeling etc :-)

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"

set wallpaper on windowmaker in one line
set directly the wallpaper on windowmaker , use this command with display of imagemagick :)

Get all documents (doc,docx,xls,xlsx,pdf,ppt,pptx,...) linked in a webpage


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