1 global flag

sed ‘s/xxx/xxx/‘ inputfile，如果没有带global flag g的话，匹配替换的只是inputfile中的每一行的第一个匹配项。如果带了g的话，才会全部都替换。\

例子：MBA_students.txt
102,Jason Smith,IT Manager
103,Raj Reddy,Sysadmin
104,Anand Ram,Developer
105,Jane Miller,Sales Manager

sed ‘s/a/A/‘ MBA_students.txt

输出：
102,JAson Smith,IT Manager
103,RAj Reddy,Sysadmin
104,AnAnd Ram,Developer
105,JAne Miller,Sales Manager

sed ‘s/a/A/‘ MBA_students.txt

输出：

102,JAson Smith,IT MAnAger
103,RAj Reddy,SysAdmin
104,AnAnd RAm,Developer
105,JAne Miller,SAles MAnAger

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