rename 's/(.*)$/new.$1/' original.filenamefor filename in *.jpg; do mv "$filename" "prefix_$filename"; done;mv {,new.}original.filename
date --date="19-FEB-12" +%sdate +%sNOW=`date +%s`
THEN=`date --date="19-FEB-12" +%s`
let DIFF=$NOW-$THEN
echo "The difference is: $DIFF"
# Creat source folder and files and blank destination folder
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ mkdir src dst
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ mkdir src/a
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ echo "hell a" > src/a/file1.txt
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ tree
.
├── dst
└── src
└── a
└── file1.txt
# rsync to test folder and file synch. Both 'a' and 'file1' appeared under 'dst'.
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ rsync --delete --checksum --recursive src/ dst/
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ tree
.
├── dst
│ └── a
│ └── file1.txt
└── src
└── a
└── file1.txt
# Test newly added folder 'b' being synched
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ mkdir src/b
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ rsync --delete --checksum --recursive src/ dst/
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ tree
.
├── dst
│ ├── a
│ │ └── file1.txt
│ └── b
└── src
├── a
│ └── file1.txt
└── b
# Test newly added file 'file2.txt' being synched
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ echo "hell b" > src/b/file2.txt
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ rsync --delete --checksum --recursive src/ dst/
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ tree
.
├── dst
│ ├── a
│ │ └── file1.txt
│ └── b
│ └── file2.txt
└── src
├── a
│ └── file1.txt
└── b
└── file2.txt
# Test newly delete folder 'a' and 'file1.txt' inside being synched.
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ rm -rf src/a/
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ rsync --delete --checksum --recursive src/ dst/
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ tree
.
├── dst
│ └── b
│ └── file2.txt
└── src
└── b
└── file2.txt
# Test newly delete file 'file2.txt' being synched.
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ rm src/b/file2.txt
rm: remove regular file ‘src/b/file2.txt’? y
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ rsync --delete --checksum --recursive src/ dst/
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ tree
.
├── dst
│ └── b
└── src
└── b
# Add back 'file2.txt' and check
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ echo "hell b" > src/b/file2.txt
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ rsync --delete --checksum --recursive src/ dst/
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ tree
.
├── dst
│ └── b
│ └── file2.txt
└── src
└── b
└── file2.txt
# modify 'file2.txt' and check synch
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ cat dst/b/file2.txt
hell b
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ vi src/b/file2.txt
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ cat src/b/file2.txt
Modified ...hello b
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ rsync --delete --checksum --recursive src/ dst/
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ cat dst/b/file2.txt
Modified ...hello b
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ tree
.
├── dst
│ └── b
│ └── file2.txt
└── src
└── b
└── file2.txt
Using cp command line for multiple files copy
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ tree
.
├── dst
│ └── b
│ └── file2.txt
└── src
├── a
│ └── file1.txt
└── b
├── file2.txt
└── file3.txt
5 directories, 4 files
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ cp {src/a/file1.txt,src/b/file{2..3}.txt} dst/
qyang@lubuntu-laptop:~/Trash/Sandbox-Trial$ tree
.
├── dst
│ ├── b
│ │ └── file2.txt
│ ├── file1.txt
│ ├── file2.txt
│ └── file3.txt
└── src
├── a
│ └── file1.txt
└── b
├── file2.txt
└── file3.txt
explorer . # For windows command line nautilus . # Linux command line open . # MAC OS X dolphin . # Linux KDE 4
cp {*.doc,*.pdf} ~
This will copy anything ending with .doc or .pdf to the users home directory. Note that spaces are not allowed after the commas (or anywhere else).find -regex ".*\.\(xls\|csv\)"find -name "*.xls" -o -name "*.csv"cat << EOF > /etc/yum.repos.d/google-chrome.repo [google-chrome] name=google-chrome - \$basearch baseurl=http://dl.google.com/linux/chrome/rpm/stable/\$basearch enabled=1 gpgcheck=1 gpgkey=https://dl-ssl.google.com/linux/linux_signing_key.pub EOF#yum install google-chrome-stable
$ ifconfig -a | grep HWaddr
eth0 Link encap:Ethernet HWaddr 00:80:48:BA:d1:20
# ifconfig eth0 down
# ifconfig eth0 hw ether 00:80:48:BA:d1:30
# ifconfig eth0 up
# ifconfig eth0 |grep HWaddrIn Linux, Windows, Mac OS X, or a different operating system,
changing MAC address is only temporary.
Once you reboot your machine, the operating system reflects the
physical MAC address burnt in your network card and not the MAC address you set.
date command. As an example, to set the current time and date to July 31, 11:16pm, type ``date 07312316'' (note that the time is given in 24 hour notation). If you wanted to change the year as well, you could type ``date 073123161998''. To set the seconds as well, type ``date 07312316.30'' or ``date 073123161998.30''. To see what Linux thinks the current local time is, run date with no arguments./sbin/hwclock --systohc'' (or ``/sbin/hwclock --systohc --utc'' if you are keeping the hardware clock in UTC). To see what the hardware clock is currently set to, run hwclock with no arguments. If the hardware clock is in UTC and you want to see the local equivalent, type ``/sbin/hwclock --utc''
