Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.
How to adjust the argument position in xargs?
Answer:
Sometimes you might want to adjust the argument position when using the xargs command, e.g.
echo "foo" | xargs echo "bar"
It gives:
bar foo
Instead, you want the piped argument "foo" to be inserted before the "bar", you can use
echo "foo" | xargs -i echo {} "bar"
Now it gives:
foo bar
That's very handy
How to extract RPM package without installing it
Answer:
Assume you have foo.rpm, type the following command to extract the rpm's contents
rpm2cpio foo.rpm | cpio -idmv
Change password in Linux
Answer:
passwd (Change your own password)
passwd john (Change john's password)
passwd -d john (Delete john's password)
How to send an email using a single command?
Answer:
# echo World | mail -s Hello [email protected]
If you would like to specify the from email address, you can use
# echo World | mail -aFrom:[email protected] -s Hello [email protected]
How to create a dummy file with a given size in Linux?
Answer:
Use the dd command
Example:
dd if=/dev/zero of=test.txt bs=1 count=1MB
The above command will create a 1MB dummy file and stored as test.txt
