Unix Shell Programming Third Edition phần 3 docx

... Information:/:/usr/bin/sh george:*:75:75::/users/george:/usr/lib/rsh steve:*:2 03: 100::/users/steve:/usr/bin/ksh pat:* :30 0 :30 0::/users/pat:/usr/bin/ksh mail:* :30 1 :30 1::/usr/mail: $ Here we've emboldened the third field of each line so that ... address=" ;39 East 12th Street > New York, N. Y. 100 03& quot; $ echo $address 39 East 12th Street New York, N. Y. 100 03 $ ec...

Ngày tải lên: 13/08/2014, 15:21

... fred.c argopt: invalid option-—q unknown option: q argument: hi there 139 The Linux Environment b544977 Ch04.qxd 12/1/ 03 8:55 AM Page 139 #include <unistd.h> int isatty(int fd); The isatty system ... setlogmask(LOG_UPTO(LOG_NOTICE)); syslog(LOG_DEBUG,”debug message, should not appear”); exit(0); } 1 63 The Linux Environment b544977 Ch04.qxd 12/1/ 03 8:55 AM Page 1 63 ❑ ICRNL: Co...

Ngày tải lên: 09/08/2014, 14:21

... 5 -rwxr-xr-x 1 steve DP3725 35 8 Jun 25 13: 31 collect -rwxr-xr-x 1 steve DP3725 1219 Jun 25 13: 31 mon -rwxr-xr-x 2 steve DP3725 89 Jun 25 13: 30 wb -rwxr-xr-x 2 steve DP3725 89 Jun 25 13: 30 writeback $ The ... Index Unix Shell Programming, Third Edition By Stephen G. Kochan, Patrick Wood Publisher : Sams Publishing Pub Date : February 27, 20 03 ISBN : 0-672 -32 490 -3 Pages :...

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 ... a particular string: $ sed -n ' /UNIX/ p' intro Just print lines containing UNIX The UNIX operating system was pioneered by Ken the design of the UNIX system was to c...

Ngày tải lên: 13/08/2014, 15:21

... of on: $ who root console Jul 8 10 :37 barney tty 03 Jul 8 12 :38 fred tty04 Jul 8 13: 40 joanne tty07 Jul 8 09 :35 tony tty19 Jul 8 08 :30 lulu tty 23 Jul 8 09:55 3 c d e 2 d e 1 e 0 $ If you try to ... who Who's on? root console Jul 8 10 :37 barney tty 03 Ju1 8 12 :38 fred tty04 Jul 8 13: 40 joanne tty07 Jul 8 09 :35 tony tty19 Jul 8 08 :30 lulu tty 23 Jul 8 09:55 $ on pa...

Ngày tải lên: 13/08/2014, 15:21

... laser1 -33 (standard input) request id is laser1 -34 (standard input) request id is laser1 -35 (standard input) request id is laser1 -36 (standard input) $ The four words memo1, memo2, memo3, and ... memo1 request id is laser1 -33 (standard input) $ run memo2 request id is laser1 -34 (standard input) $ run memo3 request id is laser1 -35 (standard input) $ run memo4 request id is laser1 -36 (s...

Ngày tải lên: 13/08/2014, 15:21

... %12d\n" $number1 $number2 done $ cat data 1 234 7960 5 93 -595 39 5 30 4 32 34 999 -39 4 -4 93 $ align data 1 234 7960 5 93 -595 39 5 30 4 32 34 999 -39 4 -4 93 $ In Chapters 12, 14, and 15 you'll ... to .:/users/steve:/users/steve/docs $ export y Make y known to subshells $ vartest3 x = y = 10 $ This time, vartest3 knew about y because it is an exported variable. Co...

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 ... sorted_data & Send it to the background [1] 34 23 Job number & process id from the shell $ date Do some other work Wed Oct 2 15:05:42 EDT 2002 $ wait 34 23 Now wait for the so...

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

... read num rest 39 East 12th Street, New York City 100 03 $ echo "$num\n$rest" 39 East 12th Street, New York City 100 03 $ In addition to the preceding substitutions, the shell also checks ... it's not a reserved word, the shell proceeds to step 3. 2. Next, the shell checks the command against its function list and executes it if found .3. The shell checks to see...

Ngày tải lên: 13/08/2014, 15:21