LINUXSHELLHereDocuments

今天學到一個Linux Bash的新詞語，Here docuemnts。

Frequently, your script might call on another program or script that requires input. The here document provides a way of instructing the shell to read input from the current source until a line containing only the search string is found (no trailing blanks). All of the lines read up to that point are then used as the standard input for a command.

echo "These are the web browsers on this system:"
 
# Start here document
cat << BROWSERS
mozilla
links
lynx
konqueror
opera
netscape
BROWSERS
# End here document 

從上面可以看出，以BROWSERS開始，到BROWSERS結束為一個文檔。