AWK 模式中使用变量

[root@test test]# cat file

spam ksjfkd   spam

ksdjfks spam sldkjfkd

skdfj la sdfkj sfsal fals f

kdsfj   spam   kdjfksjf

skdf lsf lsf slf s f

ksdjfk skdjfks spam

kkkj sdkfjs sdkfjls lsdjf s

ksdjff ksjfsl   lksjdf kj fas 

spam lskdjfl asslkdf as fs spam 

slkf spam ls dflak fsdf lsdf 

[root@test test]# awk -v Sname='spam' '$1 ~ Sname {print } ' file 

spam ksjfkd   spam

spam lskdjfl asslkdf as fs spam