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ECHO
$ echo line one > myfile
$ echo line two >> myfile
$ echo line three >> myfile
">" to create the file
">>" to add a line to an existing file
$ echo $VARIABLE
Displays the current contents of $VARIABLE
CAT
$ cat << EOF > myfile
> line one
> line two
> line three
> EOF
$
Note that "EOF" is not a command, but a variable chosen at your leisure.
Alternatively:
$ cat > myfile
> line one
> line two
> line three
[CTRL+D]
$ cat FILE1 FILE2
Concatenates the two files and display the output
$ cat FILE1 FILE2 > NEWFILE
Concatenates the two files and save the output into NEWFILE
$ cat FILE >> EXISTINGFILE
Append FILE to the end of EXISTINGFILE
$ head -15 FILE
Displays the first 15 lines of a file. Predefined: 10
$ tail -15 FILE
Displays the last 15 lines of a file. Predefined: 10
zat, zecho, zless, zmore, zgrep, zdiff
Same as the related commands, but for compressed files
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