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Top Forums Shell Programming and Scripting How to check the status of sftp connection is successful or not in Linux? Post 302967344 by Don Cragun on Tuesday 23rd of February 2016 04:37:13 AM
Old 02-23-2016
It is pretty safe to say that a shell script with mismatched backquotes will not work.

If you had matched backquotes, without knowing what ftp commands you're running on the server named by the expansion of $HOST, we have absolutely no way to guess at whether or not one or more occurrences of the string 226 will appear in the output of your unspecified ftp commands.

You talk about SFTP and you call ftp in your script. We assume that you know that there is no SFTP command, that sftp and ftp are similar but different, and that copying a script from a Google search without knowing that you are trying to do EXACTLY the same thing described in that search means that you should be prepared to adapt that script to match your environment and requirements.

Since you haven't told us what constitutes successful completion of your stfp commands, we have absolutely no way to guess whether or not the unspecified ftp commands in your script have succeeded or not. In many cases you could check the exit status of an ftp or sftp command to determine whether or not it succeeded, but again we do not know what you're trying to do.

A very good way to determine whether or not some code will work is to run that code and see if it works. Run it with tracing turned on and learn more about what each step is doing. Check the exit status of every command you're running and learn more about what each command is doing. You make it sound as though you haven't tried running any code. We can tell you that unless you try running code in your environment, we will never be able to reliably predict whether or not any code will work on a network of machines about which we know nothing.
 

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SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME
script -- make typescript of terminal session SYNOPSIS
script [-akq] [-t time] [file [command ...]] DESCRIPTION
The script utility makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript. If the argument command is given, script will run the specified command with an optional argument vector instead of an interactive shell. The following options are available: -a Append the output to file or typescript, retaining the prior contents. -k Log keys sent to program as well as output. -q Run in quiet mode, omit the start and stop status messages. -t time Specify time interval between flushing script output file. A value of 0 causes script to flush for every character I/O event. The default interval is 30 seconds. The script ends when the forked shell (or command) exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-D (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. The script utility works best with commands that do not manipulate the screen. The results are meant to emulate a hardcopy terminal, not an addressable one. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism). HISTORY
The script command appeared in 3.0BSD. BUGS
The script utility places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. It is not possible to specify a command without also naming the script file because of argument parsing compatibility issues. When running in -k mode, echo cancelling is far from ideal. The slave terminal mode is checked for ECHO mode to check when to avoid manual echo logging. This does not work when in a raw mode where the program being run is doing manual echo. BSD
January 22, 2004 BSD
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