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vi can be customized on a per-user basis by creating an .exrc file in each user s home directory, which they can then modify with their own settings. You can map commands to function keys on the keyboard, and set various modes to be the default.
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Part II:
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In the following example .exrc, we set showmode and autoindent to be the default modes when opening all text files, and map the F1 and F2 keys to set line numbering and then turn it off, respectively:
set set map map showmode autoindent #1: set number #2: set nonumber
Any valid ex command can be included in the .exrc file.
Text-Processing Utilities
Solaris has many user commands available to perform tasks ranging from text processing, to file manipulation, to terminal management. In this section, we look at some standard UNIX utilities that are the core of using a shell in Solaris. However, readers are urged to obtain an up-to-date list of the utilities supplied with Solaris by typing this command:
$ man intro
The cat command displays the contents of a file to standard output, without any kind of pagination or screen control. It is most useful for viewing small files, or for passing the contents of a text file through another filter or utility (e.g., the grep command, which searches for strings). To examine the contents of the groups database, for example, you would use the following command:
$ cat /etc/group root::0:root other::1: bin::2:root,bin,daemon sys::3:root,bin,sys,adm adm::4:root,adm,daemon uucp::5:root,uucp mail::6:root tty::7:root,tty,adm lp::8:root,lp,adm nuucp::9:root,nuucp staff::10: postgres::100: daemon::12:root,daemon sysadmin::14: nobody::60001: noaccess::60002: nogroup::65534:
Part II:
System Essentials
The cat command is not very useful for examining specific sections of a file. For example, if you need to examine the first few lines of a web server s log files, using cat would display them, but they would quickly scroll off the screen out of sight. However, you can use the head command to display only the first few lines of a file. This example extracts the lines from the log file of the Borland Application Server:
$ head access_log 203.16.206.43 - - [31/Jan/2004:14:32:52 +1000] "GET /index.jsp HTTP/1.0" 200 24077 203.16.206.43 - - [31/Jan/2004:14:32:52 +1000] "GET /data.jsp HTTP/1.0" 200 13056 203.16.206.43 - - [31/Jan/2004:14:32:52 +1000] "GET /names.jsp HTTP/1.0" 200 15666 203.16.206.43 - - [31/Jan/2004:14:32:52 +1000] "GET /database.jsp HTTP/1.0" 200 56444 203.16.206.43 - - [31/Jan/2004:14:32:52 +1000] "GET /index.jsp HTTP/1.0" 200 24077 203.16.206.43 - - [31/Jan/2004:14:32:52 +1000] "GET /index.jsp HTTP/1.0" 200 24077 203.16.206.43 - - [31/Jan/2004:14:32:52 +1000] "GET /names.jsp HTTP/1.0" 200 15666 203.16.206.43 - - [31/Jan/2004:14:32:53 +1000] "GET /database.jsp HTTP/1.0" 200 56444 203.16.206.43 - - [31/Jan/2004:14:32:53 +1000] "GET /index.jsp HTTP/1.0" 200 24077 203.16.206.43 - - [31/Jan/2004:14:32:53 +1000] "GET /search.jsp HTTP/1.0" 200 45333
Instead, if you just want to examine the last few lines of a file, you could use the cat command to display the entire file, ending with the last few lines, or you could use the tail command to specifically display these lines. If the file is large (e.g., an Inprise Application Server log file of 2MB), displaying the whole file using cat would be a large waste of system resources, whereas tail is very efficient. Here s an example of using tail to display the last several lines of a file:
$ tail access_log 203.16.206.43 - 203.16.206.43 - 203.16.206.43 - 203.16.206.43 - 203.16.206.43 - 203.16.206.43 - 203.16.206.43 - 203.16.206.43 - 203.16.206.43 - 203.16.206.43 - -
[31/Aug/2004:14:32:52 [31/Aug/2004:14:32:52 [31/Aug/2004:14:32:52 [31/Aug/2004:14:32:52 [31/Aug/2004:14:32:52 [31/Aug/2004:14:32:52 [31/Aug/2004:14:32:52 [31/Aug/2004:14:32:53 [31/Aug/2004:14:32:53 [31/Aug/2004:14:32:53
+1000] +1000] +1000] +1000] +1000] +1000] +1000] +1000] +1000] +1000]
"GET "GET "GET "GET "GET "GET "GET "GET "GET "GET
/index.jsp /index.jsp /index.jsp /index.jsp /index.jsp /index.jsp /index.jsp /index.jsp /index.jsp /index.jsp
HTTP/1.0" HTTP/1.0" HTTP/1.0" HTTP/1.0" HTTP/1.0" HTTP/1.0" HTTP/1.0" HTTP/1.0" HTTP/1.0" HTTP/1.0"
200 200 200 200 200 200 200 200 200 200
24077 24077 24077 24077 24077 24077 24077 24077 24077 24077
6:
Te x t P r o c e s s i n g a n d E d i t i n g
Now, imagine that you were searching for a particular string within the access_log file, such as a 404 error code, which indicates that a page has been requested that does not exist. Webmasters regularly check log files for this error code, to create a list of links that need to be checked. To view this list, you can use the grep command to search the file for a specific string (in this case, 404 ), and you can use the more command to display the results page by page:
$ grep 404 access_log | more 203.16.206.56 - - [31/Aug/2004:15:42:54 +1000] "GET /servlet/LibraryCatalog command=mainmenu HTTP/1.1" 200 21404 203.16.206.56 - - [01/Sep/2004:08:32:12 +1000] "GET /servlet/LibraryCatalog command=searchbyname HTTP/1.1" 200 14041 203.16.206.237 - - [01/Sep/2004:09:20:35 +1000] "GET /images/LINE.gif HTTP/1.1" 404 1204 203.16.206.236 - - [01/Sep/2004:10:10:35 +1000] "GET /images/black.gif HTTP/1.1" 404 1204 203.16.206.236 - - [01/Sep/2004:10:10:40 +1000] "GET /images/white.gif HTTP/1.1" 404 1204 203.16.206.236 - - [01/Sep/2004:10:10:47 +1000] "GET /images/red.gif HTTP/1.1" 404 1204 203.16.206.236 - - [01/Sep/2004:10:11:09 +1000] "GET /images/yellow.gif HTTP/1.1" 404 1204 203.16.206.236 - - [01/Sep/2004:10:11:40 +1000] "GET /images/LINE.gif HTTP/1.1" 404 1204 203.16.206.236 - - [01/Sep/2004:10:11:44 +1000] "GET /images/LINE.gif HTTP/1.1" 404 1204 203.16.206.236 - - [01/Sep/2004:10:12:03 +1000] "GET /images/LINE.gif HTTP/1.1" 404 1204 203.16.206.41 - - [01/Sep/2004:12:04:22 +1000] "GET /data/books/576586955.pdf HTTP/1.0" 404 1204 --More--
These log files contain a line for each access to the Web server, with entries relating to the source IP address, date and time of access, the HTTP request string sent, the protocol used, and the success/error code. When you see the --More-- prompt, you can press the SPACEBAR to advance to the next screen, or you can press ENTER to advance by a single line in the results. As you have probably guessed, the pipe operator (|) was used to pass the results of the grep command through to the more command. In addition to the pipe, you can use four other operators on the command line to direct or append input streams to standard output, or output streams to standard input. Although that sounds convoluted, directing the output of a command into a new file (or appending it to an existing file) can be very useful when working with files. You can also generate the input to a command from the output of another command. These operations are performed by the following operators: > >> Redirects standard output to a file. Appends standard output to a file.
Part II:
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