TCL/Expect script with if/else logic based on host IP address
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So I have been using and enjoying /usr/bin/expect for scripts because it can quickly log me into servers since it autocompletes my userid and password. Through some cursory reading, I've come to understand that it is basically a superset of TCL, which I admit knowing nothing about.
I ssh into my server all the time with my MacBook Pro, and I want to take my login script a step further and have it log into the NAS on my internal network one way if I am on my home network (with the RFC-1918 IP space of 192.168.0.0/24), and log into it externally a different way if I am not on that network. Basically an if-else condition.
A command to return the current IPv4 host address (at least on macOS) is:
ifconfig en0 | grep 'inet' | awk '$1 == "inet" { print $2 }'
(Replace en0 with the interface being used as necessary; it's the Wi-Fi on my Mac.)
This returns the IPv4 address. I was thinking this command should be called by some function (which TCL apparently calls procedures) and its output returned to an if-else condition that then executes the appropriate set of commands and exits the script.
I've got as far as doing simple if-else but I am not sure how the standard output from commands can be incorporated into the script. Any ideas?
script shell-script conditional-statements expect tcl
asked Mar 5 at 5:38
user1004512user1004512
61
add a comment |
So I have been using and enjoying /usr/bin/expect for scripts because it can quickly log me into servers since it autocompletes my userid and password. Through some cursory reading, I've come to understand that it is basically a superset of TCL, which I admit knowing nothing about.
I ssh into my server all the time with my MacBook Pro, and I want to take my login script a step further and have it log into the NAS on my internal network one way if I am on my home network (with the RFC-1918 IP space of 192.168.0.0/24), and log into it externally a different way if I am not on that network. Basically an if-else condition.
A command to return the current IPv4 host address (at least on macOS) is:
ifconfig en0 | grep 'inet' | awk '$1 == "inet" { print $2 }'
(Replace en0 with the interface being used as necessary; it's the Wi-Fi on my Mac.)
This returns the IPv4 address. I was thinking this command should be called by some function (which TCL apparently calls procedures) and its output returned to an if-else condition that then executes the appropriate set of commands and exits the script.
I've got as far as doing simple if-else but I am not sure how the standard output from commands can be incorporated into the script. Any ideas?
script shell-script conditional-statements expect tcl
asked Mar 5 at 5:38
user1004512user1004512
61
take a look at sexpect (Expect for Shells) which you can use to write Expect scripts with shell code only.
– pynexj
Mar 5 at 6:57
You'll find it helpful to run through the Tcl tutorial
– glenn jackman
Mar 5 at 18:09
add a comment |
So I have been using and enjoying /usr/bin/expect for scripts because it can quickly log me into servers since it autocompletes my userid and password. Through some cursory reading, I've come to understand that it is basically a superset of TCL, which I admit knowing nothing about.
I ssh into my server all the time with my MacBook Pro, and I want to take my login script a step further and have it log into the NAS on my internal network one way if I am on my home network (with the RFC-1918 IP space of 192.168.0.0/24), and log into it externally a different way if I am not on that network. Basically an if-else condition.
A command to return the current IPv4 host address (at least on macOS) is:
ifconfig en0 | grep 'inet' | awk '$1 == "inet" { print $2 }'
(Replace en0 with the interface being used as necessary; it's the Wi-Fi on my Mac.)
This returns the IPv4 address. I was thinking this command should be called by some function (which TCL apparently calls procedures) and its output returned to an if-else condition that then executes the appropriate set of commands and exits the script.
I've got as far as doing simple if-else but I am not sure how the standard output from commands can be incorporated into the script. Any ideas?
script shell-script conditional-statements expect tcl
asked Mar 5 at 5:38
user1004512user1004512
61
So I have been using and enjoying /usr/bin/expect for scripts because it can quickly log me into servers since it autocompletes my userid and password. Through some cursory reading, I've come to understand that it is basically a superset of TCL, which I admit knowing nothing about.
I ssh into my server all the time with my MacBook Pro, and I want to take my login script a step further and have it log into the NAS on my internal network one way if I am on my home network (with the RFC-1918 IP space of 192.168.0.0/24), and log into it externally a different way if I am not on that network. Basically an if-else condition.
A command to return the current IPv4 host address (at least on macOS) is:
ifconfig en0 | grep 'inet' | awk '$1 == "inet" { print $2 }'
(Replace en0 with the interface being used as necessary; it's the Wi-Fi on my Mac.)
This returns the IPv4 address. I was thinking this command should be called by some function (which TCL apparently calls procedures) and its output returned to an if-else condition that then executes the appropriate set of commands and exits the script.
I've got as far as doing simple if-else but I am not sure how the standard output from commands can be incorporated into the script. Any ideas?
script shell-script conditional-statements expect tcl
script shell-script conditional-statements expect tcl
asked Mar 5 at 5:38
user1004512user1004512
61
asked Mar 5 at 5:38
user1004512user1004512
61
asked Mar 5 at 5:38
user1004512user1004512
61
asked Mar 5 at 5:38
user1004512user1004512
61
asked Mar 5 at 5:38
user1004512user1004512
61
61
take a look at sexpect (Expect for Shells) which you can use to write Expect scripts with shell code only.
– pynexj
Mar 5 at 6:57
You'll find it helpful to run through the Tcl tutorial
– glenn jackman
Mar 5 at 18:09
add a comment |
take a look at sexpect (Expect for Shells) which you can use to write Expect scripts with shell code only.
– pynexj
Mar 5 at 6:57
You'll find it helpful to run through the Tcl tutorial
– glenn jackman
Mar 5 at 18:09
take a look at sexpect (Expect for Shells) which you can use to write Expect scripts with shell code only.
– pynexj
Mar 5 at 6:57
take a look at sexpect (Expect for Shells) which you can use to write Expect scripts with shell code only.
– pynexj
Mar 5 at 6:57
You'll find it helpful to run through the Tcl tutorial
– glenn jackman
Mar 5 at 18:09
You'll find it helpful to run through the Tcl tutorial
– glenn jackman
Mar 5 at 18:09
add a comment |
1 Answer
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To get the output of a command in Tcl, use exec:
- https://stackoverflow.com/questions/12605741/how-to-get-the-results-standard-output-of-a-tcl-exec-command
- https://www.tcl.tk/man/tcl/TclCmd/exec.htm
For example, set myvar [exec "date -u"]
answered Mar 5 at 5:56
grawitygrawity
243k37513570
add a comment |
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1 Answer
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1 Answer
1
active
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To get the output of a command in Tcl, use exec:
- https://stackoverflow.com/questions/12605741/how-to-get-the-results-standard-output-of-a-tcl-exec-command
- https://www.tcl.tk/man/tcl/TclCmd/exec.htm
For example, set myvar [exec "date -u"]
answered Mar 5 at 5:56
grawitygrawity
243k37513570
add a comment |
To get the output of a command in Tcl, use exec:
- https://stackoverflow.com/questions/12605741/how-to-get-the-results-standard-output-of-a-tcl-exec-command
- https://www.tcl.tk/man/tcl/TclCmd/exec.htm
For example, set myvar [exec "date -u"]
answered Mar 5 at 5:56
grawitygrawity
243k37513570
add a comment |
To get the output of a command in Tcl, use exec:
- https://stackoverflow.com/questions/12605741/how-to-get-the-results-standard-output-of-a-tcl-exec-command
- https://www.tcl.tk/man/tcl/TclCmd/exec.htm
For example, set myvar [exec "date -u"]
answered Mar 5 at 5:56
grawitygrawity
243k37513570
To get the output of a command in Tcl, use exec:
- https://stackoverflow.com/questions/12605741/how-to-get-the-results-standard-output-of-a-tcl-exec-command
- https://www.tcl.tk/man/tcl/TclCmd/exec.htm
For example, set myvar [exec "date -u"]
answered Mar 5 at 5:56
grawitygrawity
243k37513570
answered Mar 5 at 5:56
grawitygrawity
243k37513570
answered Mar 5 at 5:56
grawitygrawity
243k37513570
answered Mar 5 at 5:56
grawitygrawity
243k37513570
243k37513570
add a comment |
add a comment |
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take a look at sexpect (Expect for Shells) which you can use to write Expect scripts with shell code only.
– pynexj
Mar 5 at 6:57
You'll find it helpful to run through the Tcl tutorial
– glenn jackman
Mar 5 at 18:09