求助: shell 如何grep 得到下一行的数值

wazhl

#bdf
Filesystem          kbytes    used   avail %used Mounted on
/dev/vg00/lvol3    1048576  419736  623936   40% /
/dev/vg00/lvol1     511672   41512  418992    9% /stand
/dev/vg00/lvol8    5242880  994512 4215832   19% /var
/dev/vg00/lvol7    3145728 1278664 1852488   41% /usr
/dev/vg00/lvol4    2097152 1327048  764288   63% /tmp
/dev/vg00/lvol6    5242880 1834168 3382144   35% /opt
/dev/vg00/lvol5    2097152  166176 1915944    8% /home
/dev/vg00/lvol9    21037056 2492536 18255320   12% /app
bilud01:/backup/software/media
                   157261824 44812008 111571792   29% /backup145



想取出 used 的数据,如何一条命令实现?

格式如
/dev/vg00/lvol3   40% /
/dev/vg00/lvol1     9% /stand
/dev/vg00/lvol8     19% /var
/dev/vg00/lvol7    41% /usr
/dev/vg00/lvol4    63% /tmp
/dev/vg00/lvol6    35% /opt
/dev/vg00/lvol5    8% /home
/dev/vg00/lvol9    12% /app
bilud01:/backup/software/media 29% /backup145

[ 本帖最后由 wazhl 于 2008-6-14 08:29 编辑 ]

liyong_nb

bdf | awk 'NR>1{print $1,$5,$6}'

liaosnet

要注意的是最后一行~~这个以前讨论过的~~

vincentn

awk 'NR>1{if(NF==1){printf("%s ",$1);getline;print $(NF-1),$NF}else{print $1,$(NF-1),$NF}}'

liaosnet

原帖由 vincentn 于 2008-6-14 12:42 发表
awk 'NR>1{if(NF==1){printf("%s ",$1);getline;print $(NF-1),$NF}else{print $1,$(NF-1),$NF}}'

差不多的,修改下.

1. bdf | awk 'NR>1{if(NF<6){f1=$1;getline;print f1,$(NF-1),$NF}else{print $1,$(NF-1),$NF}}'

复制代码

walkerxk

如果LZ一定要grep的话可以看一下-A -B -C参数，-A是后面，-B是前面，-C是前后都要。
       -A NUM, --after-context=NUM
              Print  NUM  lines  of trailing context after matching lines.  Places a line containing a group
              separator (--) between contiguous groups of matches.  With the -o or  --only-matching  option,
              this has no effect and a warning is given.

       -B NUM, --before-context=NUM
              Print  NUM  lines  of leading context before matching lines.  Places a line containing a group
              separator (--) between contiguous groups of matches.  With the -o or  --only-matching  option,
              this has no effect and a warning is given.

       -C NUM, -NUM, --context=NUM
              Print  NUM  lines  of output context.  Places a line containing a group separator (--) between
              contiguous groups of matches.  With the -o or --only-matching option, this has no effect and a
              warning is given.