โปรแกรมน่าติดตั้ง
sudo apt update sudo apt install git sudo apt install curl sudo apt install tree
sudo apt install build-essential
Uninstall
sudo apt-get remove --auto-remove libcurl4-openssl-dev
ติดตั้ง Java
sudo apt install openjdk-8-jdk
$ java -version openjdk version "1.8.0_312" OpenJDK Runtime Environment (build 1.8.0_312-8u312-b07-0ubuntu1~18.04-b07) OpenJDK 64-Bit Server VM (build 25.312-b07, mixed mode)
ถ้าติดตั้ง Java ไว้หลายตัว แล้วต้องการตั้ง default ใช้คำสั่ง
sudo update-alternatives --config java
ตรวจสอบพาท
$ readlink -f /usr/bin/java | sed "s:bin/java::" /usr/lib/jvm/java-8-openjdk-amd64/jre/
Python จะติดมาอยู่แล้ว (18.04.5)
$ python3 --version Python 3.6.9
เปิด Terminal กด Ctrl-Alt-T
ดู hostname
hostnamectl
ดู current directory (print working directory)
pwd
get back to home directory:
cd
whoami command will remind you of your username
whoami
ls (list) command:
ls ls -l ls -a
Creating folders
mkdir /tmp/tutorial mkdir dir1 dir2 dir3
$ mkdir --help
Usage: mkdir [OPTION]... DIRECTORY...
Create the DIRECTORY(ies), if they do not already exist.
Mandatory arguments to long options are mandatory for short options too.
-m, --mode=MODE set file mode (as in chmod), not a=rwx - umask
-p, --parents no error if existing, make parent directories as needed
-v, --verbose print a message for each created directory
-Z set SELinux security context of each created directory
to the default type
--context[=CTX] like -Z, or if CTX is specified then set the SELinux
or SMACK security context to CTX
--help display this help and exit
--version output version information and exit
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Full documentation at: <http://www.gnu.org/software/coreutils/mkdir>
or available locally via: info '(coreutils) mkdir invocation'
mkdir -p -v dir4/dir5/dir6
Creating files using redirection
ls > output1.txt cat output1.txt echo "This is a test1" > output2.txt echo "This is a test2" >> output2.txt cat output1.txt output2.txt cat t* > combined.txt
When viewing a file through less you can use the Up Arrow, Down Arrow, Page Up, Page Down, Home and End keys to move through your file
less combined.txt
Moving and manipulating files
mv combined.txt dir1 mv dir1/* .
The mv command also lets us move more than one file at a time. If you pass more than two arguments, the last one is taken to be the destination directory and the others are considered to be files (or directories) to move.
mv combined.txt test_* dir3 dir2
cp dir4/dir5/dir6/combined.txt .
rmdir folder_* rm -r folder_6
Word count
wc -l combined.txt
$ wc --help
Usage: wc [OPTION]... [FILE]...
or: wc [OPTION]... --files0-from=F
Print newline, word, and byte counts for each FILE, and a total line if
more than one FILE is specified. A word is a non-zero-length sequence of
characters delimited by white space.
With no FILE, or when FILE is -, read standard input.
The options below may be used to select which counts are printed, always in
the following order: newline, word, character, byte, maximum line length.
-c, --bytes print the byte counts
-m, --chars print the character counts
-l, --lines print the newline counts
--files0-from=F read input from the files specified by
NUL-terminated names in file F;
If F is - then read names from standard input
-L, --max-line-length print the maximum display width
-w, --words print the word counts
--help display this help and exit
--version output version information and exit
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Full documentation at: <http://www.gnu.org/software/coreutils/wc>
or available locally via: info '(coreutils) wc invocation'
ls ~ | wc -l ls /etc | less
cat combined.txt | uniq | wc -l
man uniq | less sort combined.txt | less sort combined.txt | uniq | wc -l
tree
sudo apt install tree
$ tree /home/
/home/
└── jack
├── Desktop
├── Documents
├── Downloads
├── Music
├── Pictures
├── Public
├── Templates
└── Videos
9 directories, 0 files
tree tree -a