shell分别输出文件奇数行、偶数行

目前创新互联公司已为上千的企业提供了网站建设、域名、网页空间、网站托管维护、企业网站设计、化德网站维护等服务，公司将坚持客户导向、应用为本的策略，正道将秉承"和谐、参与、激情"的文化，与客户和合作伙伴齐心协力一起成长，共同发展。

awk

[root@114 ~]# awk 'NR%2==0' test.log   输出偶数号
2 warning: libgcc-4.4.7-4.el6.x86_64: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEY
4 Installing filesystem-2.4.30-3.el6.x86_64
6 Installing ncurses-base-5.7-3.20090208.el6.x86_64
8 Installing glibc-common-2.12-1.132.el6.x86_64
10 Installing glibc-2.12-1.132.el6.x86_64

[root@114 ~]# awk 'NR%2==1' test.log   输出奇数行
1 Installing libgcc-4.4.7-4.el6.x86_64
3 Installing setup-2.8.14-20.el6_4.1.noarch
5 Installing basesystem-10.0-4.el6.noarch
7 Installing tzdata-2013g-1.el6.noarch
9 Installing nss-softokn-freebl-3.14.3-9.el6.x86_64

 

sed

[root@114 ~]# sed -n 'n;p' test.log
2 warning: libgcc-4.4.7-4.el6.x86_64: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEY
4 Installing filesystem-2.4.30-3.el6.x86_64
6 Installing ncurses-base-5.7-3.20090208.el6.x86_64
8 Installing glibc-common-2.12-1.132.el6.x86_64
10 Installing glibc-2.12-1.132.el6.x86_64

[root@114 ~]# sed -n 'p;n' test.log
1 Installing libgcc-4.4.7-4.el6.x86_64
3 Installing setup-2.8.14-20.el6_4.1.noarch
5 Installing basesystem-10.0-4.el6.noarch
7 Installing tzdata-2013g-1.el6.noarch
9 Installing nss-softokn-freebl-3.14.3-9.el6.x86_64

[root@114 ~]# sed -n '1~2p' test.log
1 Installing libgcc-4.4.7-4.el6.x86_64
3 Installing setup-2.8.14-20.el6_4.1.noarch
5 Installing basesystem-10.0-4.el6.noarch
7 Installing tzdata-2013g-1.el6.noarch
9 Installing nss-softokn-freebl-3.14.3-9.el6.x86_64
[root@114 ~]# sed -n '2~2p' test.log
2 warning: libgcc-4.4.7-4.el6.x86_64: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEY
4 Installing filesystem-2.4.30-3.el6.x86_64
6 Installing ncurses-base-5.7-3.20090208.el6.x86_64
8 Installing glibc-common-2.12-1.132.el6.x86_64
10 Installing glibc-2.12-1.132.el6.x86_64

 

sed '1~2p'  其中1，代表firest line，2，代表间隔step，输出行=1+2*N，奇数行

sed '2~2p'   输出行=2+2*N，偶数行

 

标题名称：shell分别输出文件奇数行、偶数行
文章网址：http://scyanting.com/article/jeioih.html