Quick list of unix shell commands

Some Unix or Linux shell commands.

Cancel a command
```
Ctrl+U, Ctrl+X, or @
```
Change the working directory to /usr
```
cd /usr
```
Change the working directory back to your home directory
```
cd
```
Copy a file
```
cp oldfile newfile
```
Copy a file to another directory
```
cp oldfile dirname
```
Copy a bunch of files (e.g. filename1, filename2, …) to another directory
```
cp filename* dirname
```
Copy all the files in this directory and in all its subdirectories
```
cp -r * newdir
```
Erase a file
```
rm filename
```
Rename a file
```
mv oldname newname
```
Move a file to another directory
```
mv oldfile dirname
```
List filenames
```
ls
```
List filenames with sizes and dates
```
ls -l
```
List hidden files too
```
ls -al
```
List files and pause when screen is full
```
ls | more
```
Look at a text file
```
cat filename
```
Look at a long text file
```
more filename
```
Make a new link (name) for a file
```
ln oldname newname
```
Make new links (names) for files in a directory
```
ln dirname/* newdir
```
Combine two files
```
cat file1 file2 > newfile
```
Compare two files
```
diff file1 file2
```
Look at the manual page for the ls command
```
man ls
```
Change your password
```
passwd
```

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