Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Use awk in expect.

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Use awk in expect.
# 1  
Old 09-20-2011
Use awk in expect.
I am trying to user awk in expect command. It seems to be failing. Can someone help me correct the syntax.

This is working fine
Code:
expect -c 'spawn ssh $env(PUSER)@$env(PHOST1)  "ls -l $env(P_BKP_PATH) | grep -i $env(bktmstmp)"; expect assword ; send "$env(PASSP)\n" ; interact'


When I add an awk to it, it starts failing.
Code:
expect -c 'spawn ssh $env(PUSER)@$env(PHOST1)  "ls -l $env(P_BKP_PATH) | grep -i $env(bktmstmp) | awk '{print $5}'"; expect assword ; send "$env(PASSP)\n" ; interact'

Last edited by Franklin52; 09-20-2011 at 04:02 AM.. Reason: Please use code tags, thank you
# 2  
Old 09-20-2011
No idea about expect. But generally, during multiple program interaction you need to escape the special characters so that they can be ignored by the first program (expect engine in your case).

try awk \'{print $5}\'

You might also need to escape the "{","}" and even "$" if its a keyword in expect
I am not completely sure but you can try this.
Last edited by clx; 09-20-2011 at 03:51 AM.. Reason: typos
# 3  
Old 09-20-2011
That doesn't seem to be working. I tried giving backslash for all special characters.
# 4  
Old 09-20-2011
Hi.

It looks to me like you have:
Code:
expect -c 'long-string-of-characters'

then you added:
Code:
expect -c 'long-string awk 'awk-command-stuff' of-characters'

however:
Code:
       Enclosing characters in single quotes preserves the literal value of
       each character within the quotes.  A single quote may not occur between
       single quotes, even when preceded by a backslash.
-- excerpt from man bash

So you will need to find another method of using an awk program without using the single quotes -- perhaps making it available on the remote machine. Another possibility is to enclose the long string in double quotes. The "embedded" double quotes can be escaped and single quotes would be OK inside double quotes:
Code:
expect -c "long-string awk 'awk-command-stuff-like \"$5\"' of-characters"

Note that other special characters may then also need to be escaped.

Best wishes ... cheers, drl
Last edited by drl; 09-20-2011 at 10:15 AM..
# 5  
Old 09-20-2011
I would appreciate, if you could please give the command replacement for this as per your interpretation

expect -c 'spawn ssh $env(PUSER)@$env(PHOST1) "ls -l $env(P_BKP_PATH) | grep -i $env(bktmstmp) | awk '{print $5}'"; expect assword ; send "$env(PASSP)\n" ; interact'
# 6  
Old 09-21-2011
How about this:

Code:
expect -c "spawn ssh \$env(PUSER)@\$env(PHOST1) \"ls -l \$env(P_BKP_PATH) | grep -i \$env(bktmstmp) | awk '{print \$5}'\"; expect assword ; send \"\$env(PASSP)\n\" ; interact"

Things might be simpler if you put the expect code in a file eg:

Code:
#!/usr/bin/expect
spawn ssh $env(PUSER)@$env(PHOST1) "ls -l $env(P_BKP_PATH) | grep -i $env(bktmstmp) | awk '{print $5}'"
expect assword 
send "$env(PASSP)\n"
interact

Last edited by Chubler_XL; 09-21-2011 at 12:11 AM..
# 7  
Old 09-21-2011
Script in a file works but expect -c still doesn't work.

---------- Post updated at 01:00 AM ---------- Previous update was at 12:52 AM ----------

It would be great if some one could help me out to accomplish this with a single command. That is by using expect -c. I would need to use many of these commands in my script. Giving seperate expect file for each expect command would be a hassle.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Expect: spawn id exp5 not open while executing "expect "$" { send "sudo su -\r" }"

Hi All, i am trying to ssh to a remote machine and execute certain command to remote machine through script. i am able to ssh but after its getting hung at the promt and after pressing ctrl +d i am gettin the out put as expect: spawn id exp5 not open while executing "expect "$" {... (3 Replies)
Discussion started by: Siddharth shivh
3 Replies

2. Programming

Expect script returning string following a found expect.

I'm fairly new to scripting so this might not be possible. I am using Expect with Cisco switches and need to capture the string after finding the expect request. For example, when I issue "show version" on a Nexus switch, I'm looking to capture the current firmware version: #show version ... (0 Replies)
Discussion started by: IBGaryA
0 Replies

3. Programming

Calling another expect script inside an expect script

I have an expect script called remote that I want to call from inside my expect script called sudoers.push, here is the code that is causing me issues: set REMOTE "/root/scripts/remote" ... log_user 1 send_user "Executing remote script as $user...\n" send_user "Command to execute is: $REMOTE... (1 Reply)
Discussion started by: brettski
1 Replies

4. Shell Programming and Scripting

'Couldn't read file' error in bash script with expect, sed and awk!

Ok, so I have a bash script with an embedded expect statement. Inside of the expect statement, i'm trying to pull all of the non-comment lines from the /etc/oratab file one at a time. Here's my command: cat /etc/oratab |sed /^s*#/d\ | awk 'NR==1'|awk -F: '{print \"$1\"}'|. oraenv Now,... (0 Replies)
Discussion started by: alexdglover
0 Replies

5. Programming

Calling expect script inside another expect

Hi, Am very new to expect scripting.. Can You please suggest me how to call an expect script inside another expect script.. I tried with spawn /usr/bin/ksh send "expect main.exp\r" expect $root_prompt and spawn /usr/bin/ksh send "main.exp\r" expect $root_prompt Both... (1 Reply)
Discussion started by: Priya Amaresh
1 Replies

6. Shell Programming and Scripting

Expect - Comparison of expect value and loop selection

Hello All, I am trying to automate an installation process using expect and sh script. My problem is that during the installation process the expected value can change according to the situation. For Example if this is a first time installation then at step 3 I'll get "Do you want to accept... (0 Replies)
Discussion started by: alokrm
0 Replies

7. Shell Programming and Scripting

Need help with Expect script for Cisco IPS Sensors, Expect sleep and quoting

This Expect script provides expect with a list of IP addresses to Cisco IPS sensors and commands to configure Cisco IPS sensors. The user, password, IP addresses, prompt regex, etc. have been anonymized. In general this script will log into the sensors and send commands successfully but there are... (1 Reply)
Discussion started by: genewolfe
1 Replies

8. Shell Programming and Scripting

Expect: Beginner help with spawn and expect

Hello hello, did a quick search and didn't turn up anything helpful. I've got a book I'm sure has the answers, but I don't think I'll have time to finish it before this all has to work, so here goes~ if this isn't a good place to post and someone could direct me to another forum I'd appreciate... (1 Reply)
Discussion started by: Vryali
1 Replies

9. Shell Programming and Scripting

strange expect script behavior, or am i misunderstanding expect scripting?

Hello to all...this is my first post (so please go easy). :) I feel pretty solid at expect scripting, but I'm running into an issue that I'm not able to wrap my head around. I wrote a script that is a little advanced for logging into a remote Linux machine and changing text in a file using sed.... (2 Replies)
Discussion started by: v1k0d3n
2 Replies

10. Shell Programming and Scripting

Expect and auto expect command

I need to run a remote application(GUI) in a client.i.e on running a script in the client machine i should get the GUI application which is running in the server by providing password through the script.Will expect or autoexpect command suit for this scenario? could anyone help me by posting some... (0 Replies)
Discussion started by: arun_v
0 Replies
Login or Register to Ask a Question