perl --2013-4-9 sprintf与here文档

1.SPRINTF与PRINTF不同是，SPRINTF可以将执行的结果赋给变量；

[root@zbk11g ~]# perl p9
the data is??????? KFC
[root@zbk11g ~]#
[root@zbk11g ~]#
[root@zbk11g ~]# more p9
#!/usr/bin/perl
$cc=sprintf("the data is %10sn","KFC");
print $cc;

2.here文档

（1）.包含变量，输出变量值

[root@zbk11g ~]# perl p9
THIS IS the data is??????? KFC

[root@zbk11g ~]# more p9
#!/usr/bin/perl
$cc=sprintf("the data is %10sn","KFC");
print <<EOF;
THIS IS $cc
EOF

（2）.包含变量，但不输出变量值

[root@zbk11g ~]# perl p9
THIS IS $cc
[root@zbk11g ~]# more p9
#!/usr/bin/perl
$cc=sprintf("the data is %10sn","KFC");
print <<'EOF';
THIS IS $cc
EOF

（3）.文本内容的重复输出（X)

[root@zbk11g ~]# perl p9
THIS IS the data is??????? KFC

EOF
THIS IS the data is??????? KFC

EOF
THIS IS the data is??????? KFC

EOF
[root@zbk11g ~]# more p9
#!/usr/bin/perl
$cc=sprintf("the data is %10sn","KFC");
print << x3
THIS IS $cc
EOF

（4）.文本夹杂着OS命令，需要执行命令内容

#此项实验有些问题，正在测试，后面补上