The -i flag is assumed if neither a command file neither -c is used. Prompting is terminated via the exit command or upon EOF. The -i flag causes Expect to interactively prompt for commands rather than reading them from a file. To read from a file actually named “-” use the “./-” string. If the string “-” is supplied as a filename, instead of the standard input, it is read. This option is specified as -buffer if you are using Expectk. In order to force arbitrary files to be handled this way, we can use the -b flag. Sometimes it is desirable to read files on one line at a time. Typically, the command file is read into memory and executed in its totality. This option is identified as -file If you are using Expectk.This option is identified as -file If you are using Expectk. This flag is available as a choice because it is handy when using #! notation so can submit the other arguments to the command line. The -f flag begins a directory from which to read commands. This option is listed as -Debug if you are using Expectk. If the value is non-zero the debugger will take control before the next Tcl procedure or if it is pressed ^C or the breakpoint is interrupted, or another appropriate command for the debugger appears in the script. The -D flag provides an interactive debugger. #Xshell 5 scripts plusThis flag has the same effect as “exp_internal 1” at the beginning of the Expect script, plus the version of Expect is printed. ![]() The -d flag provides a certain diagnostic output, which mainly reports the internal activity of the commands like expect and interact. The commands are executed in the order in which they appear. Multiple commands can be executed with only one -c by dividing them with a semicolon. To prevent breaking by the shell the command has to be quoted. The -c flag prelude a command to execute before any of the scripts. Of course, the path must be exactly where the Expect is located. The /usr/local/bin path is just an example. The Expect command could be referred to implicitly to systems that support the #! notation by marking the script as executable and making the first line in the script: #!/usr/local/bin/expect -f In order to execute the list of command, the expect command reads from a cmd file. Once installed, you’ll see the expect interpreter as “/usr/bin/expect”. #Xshell 5 scripts installOr on Red Hat based systems like CentOS: $ yum install expect You can install it using the following command: $ apt-get install expect In other words the Expect is a program that talks to a variety of interactive programs according to the script.įirst you need to install the expected package in your system because it is not installed by default. Expect can communicate with multiple programs at the same time. However, not like uucp, Expect is generalized so it can be executed as a user-level command with any program and task in mind. The “Expect” name comes from the concept of sending/waiting for sequences popular by uucp, kermit and various modem management programs. ![]() #Xshell 5 scripts how toWe’ll show you how to automate shell scripts with expect command.
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