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 ... encountered. Examples $ read hours mins 10 19 $ echo "$hours:$mins" 10: 19 $ read num rest 39 East 12th Street, New York City 10003 $ echo "$num\n$rest" 39...

Ngày tải lên: 13/08/2014, 15:21

... Pizza' Remove this entry $ cat phonebook Alice Chebba 97 3-555-2015 Barbara Swingle 201-555 -92 57 Billy Bach 201-555-7618 Liz Stachiw 212-555-2 298 to achieve the same result. The double quotes are ... 10:37 barney tty03 Ju1 8 12:38 fred tty04 Jul 8 13:40 joanne tty07 Jul 8 09: 35 tony tty 19 Jul 8 08:30 lulu tty23 Jul 8 09: 55 $ on pat pat is not logged on $ on tony tony is logged o...

Ngày tải lên: 13/08/2014, 15:21

... to the background [1] 99 32 $ 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 sequences thr...

Ngày tải lên: 13/08/2014, 15:21

... %12d\n" $number1 $number2 done $ cat data 1234 796 0 593 - 595 395 304 3234 99 9 - 394 - 493 $ align data 1234 796 0 593 - 595 395 304 3234 99 9 - 394 - 493 $ In Chapters 12, 14, and 15 you'll see ... 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 Ctr...

Ngày tải lên: 13/08/2014, 15:21

... 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...

Ngày tải lên: 13/08/2014, 15:21

... Index Unix Shell Programming, Third Edition By Stephen G. Kochan, Patrick Wood Publisher : Sams Publishing Pub Date : February 27, 2003 ISBN : 0-672-32 490 -3 Pages : 456 Slots : 1 Unix Shell Programming ... 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...

Ngày tải lên: 13/08/2014, 15:21

... 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 ... phonebook Alice Chebba\t973-555-2015 Barbara Swingle\t201-555 -92 57 Jeff Goldberg\t201-555-3378 Liz Stachiw\t212-555-2 298 Susan Goldberg\t201-555-7776 Tony Iannino\t973-555-1 295...

Ngày tải lên: 13/08/2014, 15:21

... expressions? x* [0 -9] \{3\} xx* [0 -9] \{3,5\} x\{1,5\} [0 -9] \{1,3\},[0 -9] \{3\} x\{5,\} ^\ x\{10\} [A-Za-z_][A-Za-z_0 -9] * [0 -9] \([A-Za-z0 -9] \{1,\}\)\1 [0 -9] * ^Begin$ [0 -9] [0 -9] [0 -9] ^\(.\).*\1$ 2: What ... "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 beca...

Ngày tải lên: 13/08/2014, 15:21

... 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...

Ngày tải lên: 13/08/2014, 15:21

... 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...

Ngày tải lên: 13/08/2014, 15:21