Linux:bash:about "delete key"

When I use "delete key" in some bash terminal, the key sends a tilde "~" instead of deleting the char that is supposed to be deleted.

Find a solution:
1. In your $HOME directory, create or edit your keyboard-mapping file, $HOME/.inputrc
2. Add one mapping line:

"\M-[3~": delete-char

3. restart your terminal

Linux:shell:BASH: How to delete one line by sed

If you want to delete one line containing one word "ThisWord" by sed, then you can do in the way:

sed -i "/ThisWord/d" YourTextFile.txt

Note, here '-i' is to delete it from the original file. Without it, sed only prints the file on screen. So before using '-i', make sure you are doing correct things.

Linux: /tmp cleanup frequency

kerberos is working well in my laptop. However, since the temp ticket file krb5*** is stored in /tmp which is cleaned up as reboot, I cannot use kinit -R to renew the ticket-granting ticket even within its renewable life. So what I do is to change /tmp cleanup frequency. How? edit the file:

/etc/default/rcS

and check the default value of "TMPTIME", 0 means cleanup as reboot. TMPTIME=14 means that the files in the directory will be deleted in a frequency of 2 weeks.

emacs: how to delete a block of region

Mark (Ctrl+Space) the beginning of first line and move cursor to the the last line, and move it to the right n chars. Then do “Alt+x kill-rectangle” (Ctrl+x r k). This command can be used to delete any rectangular block of text, not just at the beginning of lines.

From: http://xahlee.org/emacs/emacs.html

Linux:compress: restrictions about zipped tar files

From the tar's user guide:
Notice also, that there are several restrictions on operations on compressed archives. First of all, compressed archives cannot be modified, i.e., you cannot update (--update (-u)) them or delete (--delete) members from them. Likewise, you cannot append another tar archive to a compressed archive using --append (-r)). Secondly, multi-volume archives cannot be compressed.