如何合并A，B文件成C文件？

mcolinc

原帖由 todayhero 于 2008-2-22 12:26 发表
php写的

学习了

zszjxh

这样格式不对吧，兄弟

twf_cc

fang@bash ~
$ cat filea
alter database rename file 'f:\oracle\oradata\system01.dbf' to
alter database rename file 'f:\oracle\oradata\undots01.dbf' to
alter database rename file 'f:\oracle\oradata\tools.dbf' to
alter database rename file 'f:\oracle\oradata\user01.dbf' to

fang@bash ~
$ cat fileb
'T:\oracle\oradata\system01.dbf'
'T:\oracle\oradata\undots01.dbf'
'T:\oracle\oradata\tools.dbf'
'T:\oracle\oradata\user01.dbf'

fang@bash ~
$ cat test.sh
#! /bin/bash

  while read -r a
    do
      while read -r b
        do
          echo "$a $b"
        done < fileb
     done < filea

fang@bash ~
$ sh test.sh
alter database rename file 'f:\oracle\oradata\system01.dbf' to 'T:\oracle\oradata\system01.dbf'
alter database rename file 'f:\oracle\oradata\system01.dbf' to 'T:\oracle\oradata\undots01.dbf'
alter database rename file 'f:\oracle\oradata\system01.dbf' to 'T:\oracle\oradata\tools.dbf'
alter database rename file 'f:\oracle\oradata\system01.dbf' to 'T:\oracle\oradata\user01.dbf'
alter database rename file 'f:\oracle\oradata\undots01.dbf' to 'T:\oracle\oradata\system01.dbf'
alter database rename file 'f:\oracle\oradata\undots01.dbf' to 'T:\oracle\oradata\undots01.dbf'
alter database rename file 'f:\oracle\oradata\undots01.dbf' to 'T:\oracle\oradata\tools.dbf'
alter database rename file 'f:\oracle\oradata\undots01.dbf' to 'T:\oracle\oradata\user01.dbf'
alter database rename file 'f:\oracle\oradata\tools.dbf' to 'T:\oracle\oradata\system01.dbf'
alter database rename file 'f:\oracle\oradata\tools.dbf' to 'T:\oracle\oradata\undots01.dbf'
alter database rename file 'f:\oracle\oradata\tools.dbf' to 'T:\oracle\oradata\tools.dbf'
alter database rename file 'f:\oracle\oradata\tools.dbf' to 'T:\oracle\oradata\user01.dbf'
alter database rename file 'f:\oracle\oradata\user01.dbf' to 'T:\oracle\oradata\system01.dbf'
alter database rename file 'f:\oracle\oradata\user01.dbf' to 'T:\oracle\oradata\undots01.dbf'
alter database rename file 'f:\oracle\oradata\user01.dbf' to 'T:\oracle\oradata\tools.dbf'
alter database rename file 'f:\oracle\oradata\user01.dbf' to 'T:\oracle\oradata\user01.dbf'

fang@bash ~
$

twf_cc

sorry , correct

$ cat test.sh
while read -r a
  do
while read -r b
   do
   c="$b"  
   done < filea
  echo "$c $a"
done < fileb

fang@bash ~
$ sh test.sh
alter database rename file 'f:\oracle\oradata\user01.dbf' to 'T:\oracle\oradata\system01.dbf'
alter database rename file 'f:\oracle\oradata\user01.dbf' to 'T:\oracle\oradata\undots01.dbf'
alter database rename file 'f:\oracle\oradata\user01.dbf' to 'T:\oracle\oradata\tools.dbf'
alter database rename file 'f:\oracle\oradata\user01.dbf' to 'T:\oracle\oradata\user01.dbf'

fang@bash ~
$

jinl

原帖由 chenwenming 于 2008-2-21 21:26 发表
paste 这个命令是比较好的选择   但awk也可以实现的

awk  'NR==FNR{a=$0}NR>FNR&&a[m=m++]{print $0,a[m++]}'  B  A  >C

或

awk 'NR==FNR {k=$0} NR>FNR { print $0,k[m++]}'  B A  >C

awk为什么要多用两个变量i,m来实现呢？既然知道了NR,FNR变量，直接使用就可以了

1. awk 'NR==FNR {a[FNR]=$0} NR>FNR { print $0,a[FNR]}' B A > C

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chenwenming

主要是我对 NR 与 FNR 两个变量理解不够。 学习了。

jinl

原帖由 twf_cc 于 2008-2-23 12:28 发表
sorry , correct

$ cat test.sh
while read -r a
  do
while read -r b
   do
   c="$b"  
   done < filea
  echo "$c $a"
done < fileb

fang@bash ~
$ sh test.sh
alter database rename ...

使用shell直接读取两个文件的内容，然后合并即可，不需要两次循环（当然要求文件行数一致)

1. 
   
2. while read -u3 i && read -u4 j;do
   
3. echo "$i $j"
   
4. done 3<filea 4<fileb
   

复制代码