16 shell programming

16 shell programming tài liệu linux and oss

... it and try as $ chmod 755 nt1 $./nt1 Cấutrúccase •  Cúpháp case$variable-namein pa3ern1)command command;; pa3ern2)command command;; pa3ernN)command command;; *) command ... read Statement Prev Linux Shell Scripting Tutorial (LSST) v1.05r3 Chapter 2: Getting started with Shell Programming Câulệnhđọcdữ liệu đầuvào The read Statement •  Đọcdữ liệu từbànphímvàghivàbiến ... Lậptrình shell làgì •  Shell làtrìnhthôngdịchlệnhcủa Linux –  Thườngtươngtácvớingườidùngtheotừngcâu lệnh –  Shell đọclệnhtừbànphímhoặcﬁle –  Nhờhạtnhân Linux thựchiệnlệnh •  Shell script...

Shell Programming

... standard shell variables are shell parameters Page 183 Parameters - special shell variables If you thought shell programming was the best thing since COBOL, then you haven't even begun to be awed… Shell ... alternate way of executing shell programs is to issue a command at the shell prompt to the effect of: For example: bash helloworld This simply instructs the shell to take a list ... Bourne shell (sh/bash) will not run in the C shell (csh) All the examples in this chapter are written for the Bourne shell Shell programming - HOW? Shell programs are a little different from what...

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Dive Into Python-Chapter 16. Functional Programming

... sys.argv[0] = /home/you/diveintopython/common/py/fullpath.py path = /home/you/diveintopython/common/py full path = /home/you/diveintopython/common/py [you@localhost diveintopython]$ python common/py/fullpath.py ... = /home/you/diveintopython/common/py [you@localhost diveintopython]$ cd common/py [you@localhost py]$ python fullpath.py sys.argv[0] = fullpath.py path = full path = /home/you/diveintopython/common/py ... like this without turning it into a full pathname, use os.path.normpath instead Example 16.5 Sample output from fullpath.py [you@localhost py]$ python /home/you/diveintopython/common/py/fullpath.py...

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Shell programming

... hệ thống lệnh set env Một vài biến hệ thống quan trọng: BASH=/bin/bash - tên shell BASH_VERSION=1.14.7(1) - phiên shell COLUMNS=80 - số cột cho hình HOME=/home/vivek - thư mục nhà LINES=25 - ... đường dẫn PS1=[\u@\h \W]\$ - thiết lập prompt PWD=/home/students/Common - thư mục hành SHELL= /bin/bash - tên shell USERNAME=vivek - user đăng nhập vào PC Bạn in biến môi trường sau: $ echo $USERNAME ... Tue Jan Trạng thái kết thúc (exit status): Mặc định Linux lệnh /shell script thực thi, trả hai loại giá trị - sử dụng để xem lệnh /shell script thực thi thành công hay không Nếu trả giá trị - thành...

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Chapter 16 - Web Programming with CGI ppt

... converts "broken-down" time into string • Wed Jul 31 13:10:37 2002 © 2003 Prentice Hall, Inc All rights reserved 16 16.9 Simple CGI Script • Now, need to output to Web browser – With CGI, redirect ... execute program – Put C++ executable in cgi- bin directory – Changed extension from exe to cgi • localtime .cgi – To run script • http://localhost /cgi- bin/localtime .cgi © 2003 Prentice Hall, Inc All ... reserved 16. 6 © 2003 Prentice Hall, Inc All rights reserved Requesting XHTML Documents 10 16. 7 Introduction to CGI • Common Gateway Interface (CGI) – Enables applications to interact with Web servers...

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shell programming in unix

... • • • • • • Đặc trưng Shell scripts Các biến script Các lệnh nội trú (built -in) Các cấu trúc điều khiển Các hàm Gỡ rối (debug) Lập trình shell • Shell in UNIX – Command intepretor – Ngôn ngữ ... cat foo #!/bin/sh read var1 var2 echo "First word : $var1" echo "The rest : $var2" % /foo Unix MS-DOS Windows 95 Windows NT MacOS First word : Unix The rest : MS-DOS Windows 95 Windows NT MacOS ... trình> • # [tham_số …] Cấu trúc shell- script • Chỉ thị tên shell – Dòng bắt đầu #! • #!/bin/sh • Default: shell thời NSD • Comment – # : bắt đầu comment đến...

Getting started with shell programming doc

... i.e if within if ###### if [ $osch -eq ] ; then echo "You Pick up Linux (Red Hat)" else echo "What you don't like Unix/Linux OS." fi fi Multilevel if-then-else Cú phap : ́ SHELL_ LINUX 6-18 SHELL ... ${stringZ/abc/xyz} echo ${stringZ//abc/xyz} SHELL_ LINUX # xyzABC123ABCabc # xyzABC123ABCxyz 15-18 15 SHELL -_LINUX Bai tập ̀ Bai : Viêt chương trinh shell giai phương trinh bâc hai : ax2 + bx ... – đọc giá trị nhập từ bàn phím , file … Dùng để lấy liệu nhập từ bàn phím lưu vào biến SHELL_ LINUX 2-18 SHELL -_LINUX Cú pháp : read var1 var2 var3 … varN read tham số  giá trị chứa biến $REPLY...

Unix Shell Programming Third Edition phần 1 doc

... into the specified file: $ cat users oko tty 01 Sep 12 07:30 tty15 Sep 12 13 :32 ruth tty 21 Sep 12 10 :10 pat tty24 Sep 12 13 :07 steve tty25 Sep 12 13 :03 $ If a command has its output redirected ... pat DP3822 13 58 Jan 15 11 : 01 lcat -rwxr-xr-x pat DP3822 504 Apr 21 18:30 xtr $ ln /users/steve/wb link wb to pat's bin $ ls -l total -rwxr-xr-x pat DP3822 13 58 Jan 15 11 : 01 lcat -rwxr-xr-x steve ... -rwxr-xr-x pat DP3822 lrwxr-xr-x pat DP3822 -rwxr-xr-x pat DP3822 13 58 Jan 15 11 : 01 lcat 15 Jul 20 15 :22 wb -> /users/steve/wb 504 Apr 21 18:30 xtr $ wc wb Cannot open wb: No such file or directory...

Unix Shell Programming Third Edition phần 2 pot

... 973-555 -20 15 Barbara Swingle 20 1-555- 925 7 Liz Stachiw 21 2-555 -22 98 Susan Goldberg 20 1-555-7776 Tony Iannino 973-555- 129 5 1,$s/$.*$ $.*$/ \2 \1/ Switch the two fields 1,$p 973-555 -20 15 Alice ... phonebook Alice Chebba 973-555 -20 15 Barbara Swingle 20 1-555- 925 7 Jeff Goldberg 20 1-555-3378 Liz Stachiw 21 2-555 -22 98 Susan Goldberg 20 1-555-7776 Tony Iannino 973-555- 129 5 $ If you just want to get ... phonebook Alice Chebba\t973-555 -20 15 Barbara Swingle\t201-555- 925 7 Jeff Goldberg\t201-555-3378 Liz Stachiw\t2 12- 555 -22 98 Susan Goldberg\t201-555-7776 Tony Iannino\t973-555- 129 5 $ The output verifies...

Unix Shell Programming Third Edition phần 3 docx

... 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 ... quotes: $ address= "39 East 12th Street > New York, N Y 100 03" $ echo $address 39 East 12th Street New York, N Y 100 03 $ echo "$address" 39 East 12th Street New York, N Y 100 03 $ It makes no difference ... discussions in Chapter 3, "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...

Unix Shell Programming Third Edition phần 4 pptx

... on root console Jul 10:06 wilma tty03 Jul 12:36 barney tty 04 Jul 14: 57 betty tty15 Jul 15:03 $ who | grep barney barney tty 04 Jul 14: 57 $ echo $? Print exit status of last command (grep) grep ... Susan Topple 212-555 -49 32 Tony Iannino 973-555-1295 Stromboli Pizza 973-555- 947 8 $ Stromboli Pizza was quoted so that the shell passed it along to add as a single argument ... is a sticky area that is a frequent source of shell programming errors It's good to really understand the principles here to save yourself a lot of programming headaches in the future There is...

Unix Shell Programming Third Edition phần 5 pptx

... replaced by the shell with a b c, which is three words Thus the loop was executed three times Whereas the shell replaces the value of $* with $1, $2, , if you instead use the special shell variable ... happened total -rw-r r steve steve 54 3 Jul 19 14:10 lu -rw-r r steve steve 949 Jul 21 17:11 names -rw-r r steve steve -rw-r r steve steve 38 Jul 19 09 :55 nu 498 Jul 21 17:11 prog1 -rw-r r ... sleep that suspends execution of a program for a specified number of seconds So the Unix command (this isn't a shell built-in) sleep n suspends execution of the program for n seconds At the end...

Unix Shell Programming Third Edition phần 6 ppt

... to 100 in your login shell Subshells The behavior exhibited by vartest and vartest2 is due to the fact that these two programs are run as subshells by your login shell A subshell is, for all intents ... entirely new shell executed by your login shell to run the desired program So when you ask your login shell to execute vartest, it starts up a new shell to execute the program Whenever a new shell runs, ... subshell has no knowledge of local variables that were assigned values by the login shell (the "parent" shell) Furthermore, a subshell cannot change the value of a variable in the parent shell, ...

Unix Shell Programming Third Edition phần 7 pdf

... this means that the subshells will be terminated Suppose that you execute the command trap "" and then execute a subshell, which in turn executes other shell programs as subshells If an interrupt ... because the first method uses only shell built-in commands In general, your shell programs run much faster if you try to get as much done as you can using the shell' s built-in commands Other Options ... inside IFS and then used by the shell Now let's change the IFS to something more visible, like a colon: $ IFS=: $ read x y z 123:345: 678 $ echo $x 123 $ echo $z 678 $ list="one:two:three" $ for...

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shell programming in unix

16 shell programming