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Shell Programming and Scripting
Expect_out(buffer) works but it doesn't get all lines
Post 302770407 by capacho6666 on Friday 15th of February 2013 03:34:41 PM
02-15-2013
Expect_out(buffer) works but it doesn't get all lines
Hello "expect" experts
I am new at Expect. I have searched for a little while how to capture multiple lines with Expect and I am almost succeeded on that but I don't get all the lines of a command's output that the script executes on a server.
Here is how my script works in a nutshell -
The program establishes a ssh session into an Unix server and from there it runs another ssh into another server where a command is excuted on the final target server (after authentication is satisfied). The command produces an output with multiple lines (more than 30). My program only gets the last 10 or so lines of the output.
... Here are the important lines of the code that concerns me.
(1) expect -re "${promptvio}\$"
(2) send ${command2}\r
(3) expect -re "${promptvio}\$"
(4) puts "'$expect_out(buffer)'."
(5) send "exit\r"
(6) expect "login:"
(7) send "\~\.\r
In line (1), it expects a "$" prompt
In line (2), it sends a command to the server, which produces an output with multiple lines
In line (3), it expects again the "$" prompt
In line (4), it prints the contain of $expect_out(buffer) and this is the instruction that doesn't capture all the lines of the command.
Any help, would be appreciated.
Thanks
I am new at Expect. I have searched for a little while how to capture multiple lines with Expect and I am almost succeeded on that but I don't get all the lines of a command's output that the script executes on a server.
Here is how my script works in a nutshell -
The program establishes a ssh session into an Unix server and from there it runs another ssh into another server where a command is excuted on the final target server (after authentication is satisfied). The command produces an output with multiple lines (more than 30). My program only gets the last 10 or so lines of the output.
... Here are the important lines of the code that concerns me.
(1) expect -re "${promptvio}\$"
(2) send ${command2}\r
(3) expect -re "${promptvio}\$"
(4) puts "'$expect_out(buffer)'."
(5) send "exit\r"
(6) expect "login:"
(7) send "\~\.\r
In line (1), it expects a "$" prompt
In line (2), it sends a command to the server, which produces an output with multiple lines
In line (3), it expects again the "$" prompt
In line (4), it prints the contain of $expect_out(buffer) and this is the instruction that doesn't capture all the lines of the command.
Any help, would be appreciated.
Thanks
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LEARN ABOUT DEBIAN
plan9-cat
CAT(1) General Commands Manual CAT(1) NAME
cat, read, nobs - catenate files SYNOPSIS
cat [ file ... ] read [ -m ] [ -n nline ] [ file ... ] nobs [ file ... ] DESCRIPTION
Cat reads each file in sequence and writes it on the standard output. Thus cat file prints a file and cat file1 file2 >file3 concatenates the first two files and places the result on the third. If no file is given, cat reads from the standard input. Output is buffered in blocks matching the input. Read copies to standard output exactly one line from the named file, default standard input. It is useful in interactive rc(1) scripts. The -m flag causes it to continue reading and writing multiple lines until end of file; -n causes it to read no more than nline lines. Read always executes a single write for each line of input, which can be helpful when preparing input to programs that expect line-at-a- time data. It never reads any more data from the input than it prints to the output. Nobs copies the named files to standard output except that it removes all backspace characters and the characters that precede them. It is useful to use as $PAGER with the Unix version of man(1) when run inside a win (see acme(1)) window. SOURCE
/src/cmd/cat.c /src/cmd/read.c /bin/nobs SEE ALSO
cp(1) DIAGNOSTICS
Read exits with status eof on end of file or, in the -n case, if it doesn't read nlines lines. BUGS
Beware of and which destroy input files before reading them. CAT(1)