sed 基本命令 替换、阻止输出、多重指令

list文件
[peizf@Redhat9 ch02]$ cat list
John Daggett, 341 King Road, Plymouth MA
Alice Ford, 22 East Broadway, Richmond VA
Orville Thomas, 11345 Oak Bridge Road, Tulsa OK
Terry Kalkas, 402 Lans Road, Beaver Falls PA
Eric Adams, 20 Post Road, Sudbury MA
Hubert Sims, 328A Brook Road, Roanoke VA
Amy Wilde, 334 Bayshore Pkwy, Mountain View CA
Sal Carpenter, 73 6th Street, Boston MA

● sed
-e 在命令行上给出多个指令时才需要用-e选项。告诉sed将下一个参数解释为指令。

◆ 替换命令s，
例1：用"Massachusetts"代替"MA"
[peizf@Redhat9 ch02]$ sed 's/MA/Massachusetts/' list
John Daggett, 341 King Road, Plymouth Massachusetts
Alice Ford, 22 East Broadway, Richmond VA
Orville Thomas, 11345 Oak Bridge Road, Tulsa OK
Terry Kalkas, 402 Lans Road, Beaver Falls PA
Eric Adams, 20 Post Road, Sudbury Massachusetts
Hubert Sims, 328A Brook Road, Roanoke VA
Amy Wilde, 334 Bayshore Pkwy, Mountain View CA
Sal Carpenter, 73 6th Street, Boston Massachusetts
例2：指令用单引号包起来，如有空格
[peizf@Redhat9 ch02]$ sed 's/ MA/, Massachusetts/' list
John Daggett, 341 King Road, Plymouth, Massachusetts
Alice Ford, 22 East Broadway, Richmond VA
Orville Thomas, 11345 Oak Bridge Road, Tulsa OK
Terry Kalkas, 402 Lans Road, Beaver Falls PA
Eric Adams, 20 Post Road, Sudbury, Massachusetts
Hubert Sims, 328A Brook Road, Roanoke VA
Amy Wilde, 334 Bayshore Pkwy, Mountain View CA
Sal Carpenter, 73 6th Street, Boston, Massachusetts

◆ 多重指令
1.用分号分隔指令
例1：多重指令，分号隔开
[peizf@Redhat9 ch02]$ sed 's/ MA/,Massachusetts/;s/ PA/,Pennsylvania/' list
John Daggett, 341 King Road, Plymouth,Massachusetts
Alice Ford, 22 East Broadway, Richmond VA
Orville Thomas, 11345 Oak Bridge Road, Tulsa OK
Terry Kalkas, 402 Lans Road, Beaver Falls,Pennsylyanja
Eric Adams, 20 Post Road, Sudbury,Massachusetts
Hubert Sims, 328A Brook Road, Roanoke VA
Amy Wilde, 334 Bayshore Pkwy, Mountain View CA
Sal Carpenter, 73 6th Street, Boston,Massachusetts
2.每个指令前放置-e
[peizf@Redhat9 ch02]$ sed -e 's/ MA/,Massachusetts/' -e 's/ PA/,Pennsylyanja/' list
John Daggett, 341 King Road, Plymouth,Massachusetts
Alice Ford, 22 East Broadway, Richmond VA
Orville Thomas, 11345 Oak Bridge Road, Tulsa OK
Terry Kalkas, 402 Lans Road, Beaver Falls,Pennsylyanja
Eric Adams, 20 Post Road, Sudbury,Massachusetts
Hubert Sims, 328A Brook Road, Roanoke VA
Amy Wilde, 334 Bayshore Pkwy, Mountain View CA
Sal Carpenter, 73 6th Street, Boston,Massachusetts
3.把命令存入sed脚本　
[root@Redhat9 ch02]# cat sedscr
s/ MA/, Massachusetts/
s/ PA/, Pennsylvania/
s/ CA/, California/
s/ VA/, Virginia/
s/ OK/, Oklahoma/

[root@Redhat9 ch02]# sed -f sedscr list
John Daggett, 341 King Road, Plymouth, Massachusetts
Alice Ford, 22 East Broadway, Richmond, Virginia
Orville Thomas, 11345 Oak Bridge Road, Tulsa, Oklahoma
Terry Kalkas, 402 Lans Road, Beaver Falls, Pennsylvania
Eric Adams, 20 Post Road, Sudbury, Massachusetts
Hubert Sims, 328A Brook Road, Roanoke, Virginia
Amy Wilde, 334 Bayshore Pkwy, Mountain View, California
Sal Carpenter, 73 6th Street, Boston, Massachusetts

◆ 阻止自动输出n，
[root@Redhat9 ch02]# sed -n -e 's/MA/Massachusetts/' list            // 不输出任何信息
如果替换行要显示，必须包含打印命令p
[root@Redhat9 ch02]# sed -n -e 's/MA/Massachusetts/p' list
John Daggett, 341 King Road, Plymouth Massachusetts
Eric Adams, 20 Post Road, Sudbury Massachusetts
Sal Carpenter, 73 6th Street, Boston Massachusetts