Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.
Specify a port with the scp command
Answer:
If you want to use scp to copy file to remote machine, but that ssh server is listening at port other than 22, you can use the following command syntax.
# scp -P 6000 test.txt john@remoteserver:/home/john/
Please notes it is -P, not -p.
Create ISO image from CD-ROM in Linux
Answer:
1. Put the CD in your CDROM
2. umount the CD if it was mounted automatically (assume the current mount point is at /mnt/cdrom, you can type the mount command to check if your are not sure)
# umount /mnt/cdrom
3. Create the ISO image
# dd if=/dev/cdrom of=/tmp/cd.iso
How to easy remove file with strange file name?
Answer:
Sometimes, you have a file with strange file name and you want to remove, e.g. -test.txt,
e.g.
# rm -f -test.txt
rm: invalid option -- 't'
Try `rm ./-test.txt' to remove the file `-test.txt'.
Try `rm --help' for more information.
Another easy way is delete by inode.
# ls -il *
983076 -rw-r--r-- 1 john users 0 Jun 4 21:24 -test.txt
And finally delete it
# find -inum 983076 | xargs rm -fHow to transfer your identity.pub to the remote machine’s authorized_keys?
Answer:
While you can ssh into the remote machine and edit the authorized_keys file, it is easier with the following command.
# ssh-copy-id -i identity-rsa-dsa.pub user@remote-server
List 10 most often used commands
Answer:
You can list the top 10 most often used commands in your Linux, by the following method.
# history | awk '{a[$2]++}END{for(i in a){print a[i] " " i}}' | sort -rn | head
135 ls
63 cd
48 exit
46 sudo
34 tail
30 cat
29 df
18 date
17 vi
12 pwd
