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scripting - Using while loop to ssh to multiple.

While loop in ssh command. Ask Question Asked 2 years, 1 month ago. Active 2 years ago. Viewed 624 times 0. I have requirement to connect to remote machine and then get info and pipe to while loop. ssh rao@172. SSH causes while loop to stop. 30. Using while loop to ssh to multiple servers. Ask Question Asked 5 years, 11 months ago. Active 2 years, 8 months ago. stdin input of all ssh commands in a while loop must be switched to another source. share improve this answer. answered Jun 1 '16 at.

Hi all, I have observed that ssh exits while loop. Code: The UNIX and Linux Forums. The UNIX and Linux Forums. Forums. Man. Search. Today's Posts. Quick Links. Register UNIX for Beginners Questions & Answers Ssh disturbs while loop. Tags. loop, newbies, ssh, while loop. 04/01/2011 · Yes. Add option -n to the ssh command. The standard input coming from the pipe becomes the standard input of the remote command this is the way ssh works and when the ssh command terminates it sends a SIGTTIN signal to the local shell: it closes the standard input and causes the loop.

The "cat list.txt" is providing stdin for the entire "while" loop. It is not constrained to only the read statement. ssh is eating all of the input and feeding it to "date" as stdin. My loop runs just once when I run the SSH command, however, for SCP it runs for all servers in the text file and exits, I want the loop to run till the end of text file for SSH. Following is my bash script, how can I make it run for all the servers in the text file while doing SSH?

Bash while read loop breaking early [duplicate] Ask Question Asked 10 years, 8 months ago. Active 2 years, 5 months ago. rsh and/or ssh can break a while read loop due to it using stdin. I put a -n into the ssh line which stops it from trying to use stdin and it fixed the problem. 17/07/2017 · IFS is used to set field separator default is while space. The -r option to read command disables backslash escaping e.g., \n, \t. This is failsafe while read loop for reading text files. while loop Example. Create a shell script called while.sh. and my line 29 is the last fi. And I have a lot of echo to show me the status. Now I realy don't know why it doesn't enter in the while Can you help me?? thanks.

20/01/2011 · How do I write an infinite loop in Bash script under Linux or UNIX like operating systems? An infinite loop is nothing but a sequence of instructions which loops endlessly, either due to the loop having no terminating condition, having one that can never be met, or one that causes the loop to start. To realize looping in bash, we have bash for loop along with while loop. Conclusion: In this Bash Tutorial – Bash While Loop, we have learnt about syntax of while loop statement in bash scripting for single and multiple conditions in expression with example scripts.

[solved] Process ssh command in while loop It's suppose to loop through the list of names and execute a command on the remote server using ssh. It processes the ssh command for the first server in.

I'm using a "while" loop within a shell script BASH to read line of a file one by one -- "Fortunately", its not working the No. of times the file has lines in it. Here's the summary: $ cat inp.</plaintext> 7. Loops Most languages have the concept of loops: If we want to repeat a task twenty times, we don't want to have to type in the code twenty times, with maybe a slight change each time. As a result, we have for and while loops in the Bourne shell. The problem is that do_work.sh runs ssh commands and by default ssh reads from stdin which is your input file. As a result, you only see the first line processed, because ssh consumes the rest of the file and your while loop terminates. To prevent this, pass the -n option to your ssh command to make it read from /dev/null instead of stdin.</p> <p>Hi All, I'm trying to write while loop with multiple if conditions. Each and every if condition with different variables. whenever one if condition fails i have remove the file from filename and have to pick another file and loop should exit until the last file found in filename. 15/10/2018 · While loop depend on the condition is true, if the condition is false the interpreter get out from the loop. Syntax of while loop. while [ <some condition> ]do <commands> done. We will count from 10 to 20 and print out the results. So we will put a condition that the counter less than or equal 20.</p> <p>15/06/2011 · I am having trouble getting the while loop to execute in the ssh command: ssh USERID@serverX "while read line do echo line done<list_dir/cos. shのwhileループでファイルを読み、中でsshを実行すると1回しかループしない 2011-03-18. シェルshスクリプトネタ。 while 文で以下のように指定すると、行ごとにファイルを読み込むことができる。. Hi all, I am facing an issue while trying to access a for loop variable inside ssh. Can anyone please help me with what this issue is, the following is the code that I have -> preoverflow:scroll The UNIX. 08/12/2010 · Bash Script: ssh breaks while loop. Hello, I ran across some odd behaviour using ssh in a bash script. I am hoping someone can explain it to me. I have a file called /home/user/hosts. Code: $ cat /home/user/hosts host1 host2 host3.</p> <p>Why redirect stdin inside a while read loop in bash? The clear intent here is to prevent do_something from reading from the sample.text stream, by ensuring that its stdin is coming from elsewhere. 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