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 log console output to a file?
Answer:
Use the script command, example:
# script /tmp/output.txt (start logging, everything from now will go to output.txt)
# date
# exit (finish logging)
# cat /tmp/output.txt
How to restart a frozen Linux System?
Answer:
Try the following two simple methods first:
If still not work, do the following:
How to turn off SELinux?
Answer: (pick either one)
1. Change the run-time configuration (won't take effect when you reboot)
# sestatus informs you of the two permission mode statuses,
# the current mode in runtime and the mode from the config
# file referenced during boot:
sestatus | grep -i mode
Current mode: enforcing
Mode from config file: enforcing
# Changing the runtime enforcement doesn't effect the
# boot time configuration:
setenforce 1
sestatus | grep -i mode
Current mode: permissive
Mode from config file: enforcing
2. Turn off SELinux permanently, use the following command
system-config-securitylevel
How to remove BOM from UTF-8?
Answer:
# awk '{if(NR==1)sub(/^\xef\xbb\xbf/,"");print}' text.txt
Source: http://stackoverflow.com/questions/1068650/using-awk-to-remove-the-byte-order-mark
Updated: (Suggested by Van Overveldt Peter)
# tail --bytes=+4 text.txt
