#替換,將“;hello.desktop;”替換爲“;”
#sed 's/;hello.desktop;/;/g' test>hello.tmpout
#mv hello.tmpout test
#追加,將包含“hello”的所有行後追加“this is a example”的新行
#sed '/hello/a\this is a example' test
#追加,將包含“kdkkdkdkdkkd”的所有行尾追加“hello.desktop;”,沒有新行出現
sed -i's/kdkkdkdkdkkd.*/&hello.desktop;/' test