, , . ' UNIX, . , , (, ), . .
6.1.8 " "
" " (<<) ( ) - . , . ϳ << , - . :
$ cat << zzz
> This line will be printed
>zzz
This line will be printed
$
6.1.9
, . ѳ "&&" "". , "&&", , ( 0). :
% cp hello.c hello.bak && rm hello.c
hello.c , , cp .
"||" - "". , "||", , ( 0). :
% cp hello.c hello.bak || echo Copy file error
, Copy file error.
6.1.10 - exec
exec ( , , ) , ' .
, .
6.1.11
bash 䳺 . , . ' .
(=). . . :
$ greeting="How do you do?"
. () $. . ' . :
$ echo $greeting
How do you do?
set. - , unset.
6.1.12
echo, - read. read . , ( ) - - . :
$ read greeting
How do you do
$ echo $greeting
How do you do
, " " .
