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I am new to unix and i saw a sh file with below command.
exec gpg --homedir /web/gnupg --passphrase-fd 4 ${1+"$@"} 4< /web/gnupg.passphrase
Can you please expalin the mening of 4 ${1+"$@"} 4< ...

We have 2 different servers say A and B and I want to check the log file of 2 servers simultaneously.
If I am logged into server A how can I connect to server B.
I have used ssh...

Example input file:
I will have more files like this.
See in this file i want to find the line
[9/1/14 0:21:08:050 EDT] 00000030 SystemErr R at com.abc.MyClass CustomeError"
which is the...

I am new to unix and I would like to search multiple log files to find earliest occurrence of a text.
Ex:
Say I have 10 logs file each ending with .log and I want to find the text...