在远程服务器上执行带有功能的awk脚本

Question

I have a awk scrip which includes functions like below:

for file in logfile.log; 
do 
    echo "File Name- "$file; 
    grep -v "Some Text" $file | awk -F [:\ ] '{sub(/T/, " "); if($8~500) CNT[$1":"$2]++} END {for (c in CNT) print c, "--", CNT[c]}' | sort; 
    echo "==============Done with $file=================="; 
done

But i want to execute this script on many remove servers, so i just login to our deployment (Which basically have access to all the server that i want to execute) and i am getting many compilation errors, I am using the following code:

for server in 01 02 03 04; do 
ssh web_user@webserver$server '
hostname -f;
cd /logs/dir/path;
for file in log-file-name.log; 
do 
    echo "File Name- "$file; 
    grep -v "Some Text" $file | awk -F [:\ ] '{sub(/T/, " "); if($8~500) CNT[$1":"$2]++} END {for (c in CNT) print c, "--", CNT[c]}' | sort; 
    echo "==============Done with $file=================="; 
done
'  2>&1 | grep -v 'THIS SYSTEM IS RESTRICTED'; done

Can someone please help me on this? My problem is though this script dosent have any compilation errors, i am getting many compilation errors.

Thank you in advance!!

Answer 1

In bash , a single quote ( ' ) escapes all following characters except for other single quotes. Because of that, things like {sub... in the OP will be interpreted by your local script.

To pass the script this way to the remote bash (the one opened by ssh ), you need to:

• Enclose the entire script within single quotes.

• Replace every single quote ' inside your script (not the outer ones!) by '\\'' . How this works: the first ' ends the current quotation; the \\' includes a quoted single apostrophe; the last ' reopens the quotation.

Example script:

foo=bar
echo 'foo=$foo'
echo "foo=$foo"

Expected output:

foo=$foo
foo=bar

Example invocation "by hand", ie, this is something you would type in a terminal:

ssh server '
foo=bar
echo '\''foo=$foo'\''
echo "foo=$foo"
'

However, there is a way to avoid all this quoting business: you could save the original script (with normal single quotes) in a file myscript , and run instead:

ssh server "$(cat myscript)"

This way, the local bash will no longer be confused by the single quotes appearing in myscript , because the entire content will be quoted.