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1041. Preventing password prompting
You can avoid being prompted for your password whenever you rlogin to your account on a remote system. ... Login to the remote system using rlogin. ... Use an editor to create a file .rhosts . ... Edit this file so that it contains entries for the other remote systems that you have accounts on. ... Save the file to your home directory. ... Check that the access permission for this file prevents other users from writing to it. Example .rhosts file . ...
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Ссылки http://comet.sai.msu.ru/UNIXhelp/networks/rhosts.html -- 2.4 Кб -- 17.01.1997
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1042. Logging in using rlogin
. To login to your account on a remote system use the command: rlogin remote_system_name . To login to a remote system using a different username, use the command: rlogin remote_system_name -l username . You are prompted for the password to your account on that system. Preventing password prompting . Examples .
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Ссылки http://comet.sai.msu.ru/UNIXhelp/networks/rlogin.html -- 2.1 Кб -- 17.01.1997
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1043. Logging in using telnet
. telnet enables you to connect your terminal to another remote system. To login to your account on a remote system use the command: telnet remote_system_name . You are prompted for your username and password for your account on the remote system. Once you are logged in, you can begin to issue commands on the remote system. Examples . Summary of telnet commands . Using telnet in session mode . Telnet access to the World Wide Web .
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Ссылки http://comet.sai.msu.ru/UNIXhelp/networks/telnet.html -- 2.2 Кб -- 17.01.1997
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1044. Using telnet in session mode
. To login to several remote hosts, one after the other, use a telnet "session". To do this enter the command: telnet telnet> . The telnet> prompt is displayed and you can enter commands to manage sessions on other hosts. Summary of telnet commands .
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Ссылки http://comet.sai.msu.ru/UNIXhelp/networks/telnet2.html -- 2.0 Кб -- 17.01.1997
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1045. telnet access to the World Wide Web
. The WorldWideWeb (W3) is a wide area hypermedia information retrieval initiative aiming to give universal access to a large universe of documents. To try out a simple terminal interface to W3, open a telnet connection to the host telnet.w3.org . with the username www . No password is required.
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Ссылки http://comet.sai.msu.ru/UNIXhelp/networks/www.html -- 2.0 Кб -- 17.01.1997
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1046. Problems copying files
cp: file pathname: Permission denied . Either the access permissions for this file do not permit you to copy it or the access permissions for the destination directory do not allow you to copy files into it. cp: file_pathname: Is a directory (not copied). You have tried to copy a directory. cp: file pathname: No such file or directory . The file (or directory) that you have tried to copy does not exist. ... You have forgotten to specify the destination file (or directory). ...
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Ссылки http://comet.sai.msu.ru/UNIXhelp/problems/index.html -- 2.5 Кб -- 17.01.1997
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1047. Problems linking files
. filename : Cross-device link . The file you are trying to make a link to is located on a different physical device. The solution is to create a symbolic link . directory_name is a directory . You are trying to make a link to a directory. Check the pathname for the file. ln: filename : File exists . A file with the same name as the linkname already exists in the destination directory. Use a different name for the linkname.
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Ссылки http://comet.sai.msu.ru/UNIXhelp/problems/link.html -- 2.2 Кб -- 17.01.1997
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1048. Creating the shell script
. To create a script use a text editor to create a new file containing the commands that you want the script to execute. Example .
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Ссылки http://comet.sai.msu.ru/UNIXhelp/scrpt/scrpt1.1.html -- 1.8 Кб -- 17.01.1997
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1049. Example of using a shell script
. To make a file containing a shell script executable and then run the script: display display: execute permission denied chmod u+x display display Date and time is: Mon Mar 8 10:51:17 GMT 1993 Your username is: erpl08 Your current directory is: /home/erpl08/scripts . The command display does not run the script as the user does not have execute permission for the file. They give themselves execute permission and then re-enter the command to run the script.
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Ссылки http://comet.sai.msu.ru/UNIXhelp/scrpt/scrpt1.2.2.html -- 2.2 Кб -- 17.01.1997
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1050. Problems running shell scripts
. command_name : command not found . Your shell's search path does not include the directory that the shell script is stored in. Move the file containing the shell script to the directory $HOME/bin . This directory is usually in your default search path . various messages . There are errors in the construction and syntax of the shell script. Read through your script checking its logical operations and the commands that it uses. You can also use command line options to debug your script.
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Ссылки http://comet.sai.msu.ru/UNIXhelp/scrpt/scrpt1.2.3.html -- 2.3 Кб -- 17.01.1997
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1051. Using the Bourne shell to interpret a shell script
. To make sure that your shell script is always run from a standard Bourne shell have the line #!/bin/sh . as the first line of the script.
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Ссылки http://comet.sai.msu.ru/UNIXhelp/scrpt/scrpt1.2.4.html -- 1.8 Кб -- 17.01.1997
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1052. Executing a shell script
Before using a file as a shell script you must change its access permissions so that you have execute permission on the file, otherwise the error message Permission denied is displayed. ... To give yourself execute permission for the file containing the script use the command: chmod u+rwx filename . ... To give other users permission to read and execute but not alter the shell script use: chmod go+rx filename . ... Using the Bourne shell to interpret a shell script . ...
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Ссылки http://comet.sai.msu.ru/UNIXhelp/scrpt/scrpt1.2.html -- 2.7 Кб -- 17.01.1997
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1053. Creating and executing simple shell scripts
. To create a simple shell script, you can put command lines into a file, set the proper access permissions and then execute the file. Example . Creating the shell script . Executing the shell script .
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Ссылки http://comet.sai.msu.ru/UNIXhelp/scrpt/scrpt1.html -- 1.9 Кб -- 17.01.1997
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1054. Example of a simple shell script
These are the contents of a shell script called display : cat display # This script displays the date, time, username and # current directory. echo "Date and time is:" date echo echo "Your username is: `whoami` \\n" echo "Your current directory is: \\c" pwd . The first two lines beginning with a hash ( # ) are comments and are not interpreted by the shell. Use comments to document your shell script; you will be surprised how easy it is to forget what your own programs do! ...
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Ссылки http://comet.sai.msu.ru/UNIXhelp/scrpt/scrpt1a.html -- 2.9 Кб -- 17.01.1997
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1055. Examples of passing arguments to the shell
To pass several arguments from the command line to the shell: cat first_5args # This script echoes the first five arguments # supplied to the script echo The first five command line echo arguments are $1 $2 $3 $4 $5 first_5args mines a pint john o.k. The first five command line arguments are mines a pint john o.k. This passes the arguments represented by parameters $1 through $5 to the shell script. ... This processes the three files given as arguments to the command printps . ...
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Ссылки http://comet.sai.msu.ru/UNIXhelp/scrpt/scrpt2.1.2.html -- 2.6 Кб -- 17.01.1997
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1056. Example of using the shift command
. To successively shift the argument that is represented by each positional parameter: cat shift_demo #!/bin/sh echo "arg1=$1 arg2=$2 arg3=$3" shift echo "arg1=$1 arg2=$2 arg3=$3" shift echo "arg1=$1 arg2=$2 arg3=$3" shift echo "arg1=$1 arg2=$2 arg3=$3" shift_demo one two three four five six seven arg1=one arg2=two arg3=three arg1=two arg2=three arg3=four arg1=three arg2=four arg3=five arg1=four arg2=five arg3=six arg1=five arg2=six arg3=seven .
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Ссылки http://comet.sai.msu.ru/UNIXhelp/scrpt/scrpt2.1.3.1.html -- 2.1 Кб -- 17.01.1997
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1057. Using the shift command
Usually only nine command line arguments can be accessed using positional parameters. The shift command gives access to command line arguments greater than nine by shifting each of the arguments. The second argument ($2) becomes the first ($1), the third ($3) becomes the second ($2) and so on. This gives you access to the tenth command line argument by making it the ninth. The first argument is no longer available. Successive shift commands make additional arguments available. ...
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Ссылки http://comet.sai.msu.ru/UNIXhelp/scrpt/scrpt2.1.3.html -- 2.3 Кб -- 17.01.1997
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1058. Passing arguments to the shell
Shell scripts can act like standard UNIX commands and take arguments from the command line. Arguments are passed from the command line into a shell program using the positional parameters $1 through to $9 . Each parameter corresponds to the position of the argument on the command line. ... For example: cat printps # This script converts ASCII files to PostScript # and sends them to the PostScript printer ps1 # It uses a local utility "a2ps" a2ps $* | lpr -Pps1 printps elm.txt vi.ref msg . ...
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Ссылки http://comet.sai.msu.ru/UNIXhelp/scrpt/scrpt2.1.html -- 2.8 Кб -- 17.01.1997
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1059. Getting further information
. You can get more information from the manual page for the Bourne shell (sh). To get information about shell programming with another shell, read the manual page for that shell. For example: man ksh . This will display the manual page for the Korn shell. There are a number of books on the different shells and how to program them. Many will be stocked in the computer section of most major booksellers. Or they may be available through your library.
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Ссылки http://comet.sai.msu.ru/UNIXhelp/scrpt/scrpt2.10.html -- 2.1 Кб -- 17.01.1997
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1060. Examples of environment variable names
HOME . this is the pathname of your "home" directory when you login and to which cd changes when invoked with no argument. ... defines the directories searched when the shell is looking for the file to execute when processing a command . MAIL . if set to the name of a mail file the shell will inform you of the arrival of new mail. ... contains the shell prompt string. ... is the continuation prompt when a command spans more than one line. ...
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Ссылки http://comet.sai.msu.ru/UNIXhelp/scrpt/scrpt2.2.1.html -- 2.4 Кб -- 17.01.1997
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