Unix Shell Programming Third Edition phần 8 doc
Unix Shell Programming Third Edition phần 8 doc
... what shell to start up when
you execute a shell escape. In such cases, you want to make sure that each time you start up a new
shell, you get the shell you want and not an older Bourne shell.
... you to interactive features of
the shell and two shells that have some nice features not found in the POSIX standard shell.
Getting the Right Shell
Most shells follow a convention...
Unix Shell Programming Third Edition phần 1 doc
... shell, such as
bash. Three are covered in the third edition of Unix Shell Programming. It begins with a generalized
tutorial of Unix and tools and then moves into detailed coverage of shell programming.
Topics ... shell, such as
bash. Three are covered in the third edition of Unix Shell Programming. It begins with a generalized
tutorial of Unix and tools and then m...
Unix Shell Programming Third Edition phần 3 docx
... "What Is the Shell? ," you should realize that whenever you
type something like
who | wc -l
that you are actually programming in the shell! That's because the shell is interpreting ... into
detail on the quoting mechanisms in the shell.
Variables
Like virtually all programming languages, the shell allows you to store values into variables. A shell
variable begin...
Unix Shell Programming Third Edition phần 2 pot
... occurrences of " ;Unix& quot; in the text to " ;UNIX. " This can be easily
done in sed as follows:
$ sed 's /Unix/ UNIX/' intro Substitute Unix with UNIX
The UNIX operating system ... shell also has other responsibilities, as outlined in Figure 3 .8.
Figure 3 .8. The shell& apos;s responsibilities.
Program Execution
The shell is responsible for the execution...
Unix Shell Programming Third Edition phần 4 pptx
... who Who's on?
root console Jul 8 10:37
barney tty03 Ju1 8 12: 38
fred tty04 Jul 8 13:40
joanne tty07 Jul 8 09:35
tony tty19 Jul 8 08: 30
lulu tty23 Jul 8 09:55
$ on pat
pat is not logged on
$ ... sample uses of on:
$ who
root console Jul 8 10:37
barney tty03 Jul 8 12: 38
fred tty04 Jul 8 13:40
joanne tty07 Jul 8 09:35
tony tty19 Jul 8 08: 30
lulu tty23 Jul 8 09:...
Unix Shell Programming Third Edition phần 5 pptx
... Send it to the background
[1] 9932
$
request id is laser1 -85 (standard input)
request id is laser1 -87 (standard input)
request id is laser1 -88 (standard input)
request id is laser1-92 (standard input)
I/O ... special notation is recognized by the shell when writing for commands. If you write
for var
do
command
command
done
(note the absence of the in), the shell automatically seque...
Unix Shell Programming Third Edition phần 6 ppt
... subsequently spawned subshells), the standard shell, /usr/bin/sh, is
started. From that point on, this new shell processes commands typed in from the terminal. When
Ctrl+d is typed to this shell, control ... Goes."
cd memos
the shell looks at your CDPATH variable to find the memos directory. And if your CDPATH looks like this:
$ echo $CDPATH
.:/users/steve:/users/steve/docs
$
the...
Unix Shell Programming Third Edition phần 7 pdf
... 2
and then execute a subshell, which in turn executes other shell programs as subshells. If an interrupt
signal is then generated, it will have no effect on the shells or subshells that are executing ... the subshells will be terminated.
Suppose that you execute the command
The IFS Variable
There is a special shell variable called IFS, which stands for Internal Field Separator. The she...
Unix Shell Programming Third Edition phần 9 ppt
... command-line option, or after set –o posix is executed.
Table 15.4. POSIX Shell, Korn Shell, and Bash Compatibility
POSIX Shell
Korn Shell
Bash
ENV file
X
X
POS
vi line edit mode
X
X
X
emacs line ... (for example,
/users/steve/documents) or relative to the current directory (for example, documents, /pat).
If CDPATH is non-null and directory is not a full path, the shell search...
Unix Shell Programming Third Edition phần 10 pptx
...
Bash shell
beginning of line, matching 2nd
bg command 2nd 3rd 4th 5th 6th
books
AWK Programming Language, The
Learning Pearl
Programming Pearl
Unix C Shell Field Guide, The
Unix in ... Shell Field Guide, The
Unix in a Nutshell[colon] System V Edition
Unix Programmer's Manual, Volume II
Unix Programming Environment, The
Bourne shell
Bourne, S...