有如下一个文件，如果写过滤规则才能达到要求？

采风

[root@linux root]# head -n 50 dir.ls
libip6t_ah.c
libip6t_ah.d
libip6t_ah.man
libip6t_ah_sh.o
libip6t_ah.so
libip6t_condition.c
libip6t_condition.man
libip6t_dst.c
libip6t_dst.d
libip6t_dst.man
libip6t_dst_sh.o
libip6t_dst.so
libip6t_esp.c
libip6t_esp.d
libip6t_esp.man
libip6t_esp_sh.o
libip6t_esp.so
libip6t_eui64.c
libip6t_eui64.d
libip6t_eui64.man
libip6t_eui64_sh.o
libip6t_eui64.so
libip6t_frag.c
libip6t_frag.d
libip6t_frag.man
libip6t_frag_sh.o
libip6t_frag.so
libip6t_fuzzy.c
libip6t_fuzzy.man
libip6t_hbh.c
libip6t_hbh.d
libip6t_hbh.man
libip6t_hbh_sh.o
libip6t_hbh.so
libip6t_hl.c
libip6t_HL.c
libip6t_hl.d
libip6t_HL.d
libip6t_hl.man
libip6t_HL.man
libip6t_hl_sh.o
libip6t_HL_sh.o
libip6t_hl.so
libip6t_HL.so
libip6t_icmpv6.c
libip6t_icmpv6.d
libip6t_icmpv6.man
libip6t_icmpv6_sh.o
libip6t_icmpv6.so
libip6t_ipv6header.c
[root@linux root]#  


要求：去掉_和它前面的部分（前缀）、去掉.和它后面的部分（扩展名）、只保留全是小写字母的行（不保留数字），然后把相同的行合并，并把所有行合并为一行，用逗号分格每个单词，应该怎么办？  

網中人

try:
LANG=C awk -F'[_.]' '$2~/[^A-Z]/{print $2}' dir.ls | sort -u

icesummit

我续一个笨笨的结尾：
awk -F'[_.]' '$2~/[^A-Z]/{print $2}' dir.ls | sort -u |xargs|sed 's/[ ]/,/g'

mocou

1. cat file|sed 's/\(.*\)_\(.*\)\.\(.*\)/\2/'|sort -u|xargs|sed 's/ /,/g'

复制代码

采风

[quote]原帖由 "網中人"]rint $2}' dir.ls | sort -u[/quote 发表：


结果如下：
[root@linux root]# LANG=C awk -F'[_.]' '$2~/[^A-Z]/{print $2}' dir.ls | sort -uaccount
addrtype
ah
childlevel
comment
condition
connbytes
connlimit
connmark
connrate
conntrack
dscp
dst
dstlimit
ecn
esp
eui64
frag
fuzzy
geoip
hashlimit
hbh
helper
hl
icmp
icmpv6
.
.
.
.
.
[root@linux root]
没合并到一行

采风

[quote]原帖由 "icesummit"][/quote 发表：


结果如下：
[root@linux root]# awk -F'[_.]' '$2~/[^A-Z]/{print $2}' dir.ls | sort -u |xargs|sed 's/[ ]/,/g'
account,addrtype,ah,connmark,connrate,conntrack,eui64,frag,hashlimit,icmpv6,ipp2p,iprange,ipv4options,IPV4OPTSSTRIP,ipv6header,layer7,mac,mark,matches,quota,random,realm,standard,state,targets,u32,unclean
[root@linux root]#
为什么还有大写字母？

采风

[quote]原帖由 "mocou"][/quote 发表：


结果如下：
[root@linux root]# cat dir.ls|sed 's/\(.*\)_\(.*\)\.\(.*\)/\2/'|sort -u|xargs|sed 's/ /,/g'
account,addrtype,ah,BALANCE,childlevel,CLASSIFY,CLUSTERIP,comment,condition,connbytes,connlimit,connmark,CONNMARK,connrate,conntrack,DNAT,dscp,DSCP,dst,dstlimit,ecn,ECN,esp,eui64,frag,FTOS,fuzzy,geoip,hashlimit,hbh,helper,hl,HL,icmp,icmpv6,IPMARK,ipp2p,iprange,ipv4options,IPV4OPTSSTRIP,ipv6header,layer7,layer7.c,length,limit,LOG,mac,Makefile,mark,MARK,MASQUERADE,matches,MIRROR,mport,multiport,NETLINK,NETMAP,NOTRACK,nth,osf,owner,physdev,pkttype,pool,POOL,psd,quota,random,realm,recent,REDIRECT,REJECT,ROUTE,rpc,rt,SAME,sctp,set,SET,sh,SNAT,standard,state,string,svn-commit.tmp,targets,TARPIT,tcp,TCPLAG,tcpmss,TCPMSS,time,tos,TOS,TRACE,ttl,TTL,u32,udp,ULOG,unclean,XOR
[root@linux root]#
很多大写字母，还有断行。。。

寂寞烈火

要啥样效果,

采风

[quote]原帖由 "寂寞烈火"]要啥样效果, [/quote 发表：


还要合并成一行

寂寞烈火

这效果

1. cat file|grep -o '_[a-z\_].*\.'|sed 's/^_\|\.$//g'|sort -u|xargs|tr ' ' ','

复制代码

result:

ah,ah_sh,condition,dst,dst_sh,esp,esp_sh,eui64,eui64_sh,frag,frag_sh,fuzzy,hbh,hbh_sh,hl,hl_sh,icmpv6,icmpv6_sh,ipv6header,sh