1、echo -n的作用简单的说就是不换行，像java中的System.out.print("something");
19 # In a 'for' loop (really, a type of disguised assignment):
20 echo -n "Values of \"a\" in the loop are: "
21 for a in 7 8 9 11
22 do
23 echo -n "$a "
24 done
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结果：Values of "a" in the loop are: 7 8 9 11
2、
下面这段的“!”不懂：
10 a=`echo Hello!` # Assigns result of 'echo' command to 'a'
11 echo $a
12 # Note that including an exclamation mark (!) within a
13 #+ command substitution construct #+ will not work from the command line, 14 #+ since this triggers the Bash "history mechanism."
15 # Inside a script, however, the history functions are disabled.
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3、``相当于$()
2 R=$(cat /etc/redhat-release)
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4、英语生词：
disguised
naked
trailing