1, auto Telnet in linux
assumption:
host : localhost
user/passwd : oracle/oracle
run the following command at bash shell environment, you will see an interesting automatic output . So we have the Linux's amazing experience.
( sleep 2; echo "oracle" ; sleep 2 ; echo "oracle" ;sleep 2; echo "echo hello I'm oracle person."; sleep 2; echo "ls " ;sleep 2)|telnet localhost
2, use xargs , process only ONE parameter each time:
As we all knows, xargs could convert the string in a stream to the command line parameters, by default all string in the input stream will transport to parameter in one line, But we sometimes do wanna one parameter per line. How would we do ? Here is a sample to achieve it.
ls|xargs head -1 # add all parameter into one line.
ls|xargs -L1 -r head -1 # add each parameter into each line. This is we really wanted . with "-r" , do not run command head if input stream is NULL.
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