我应该使用什么命令将文件更改为以下格式？

Question

假设我有一个输入文件如下：

的Oracle

ORAC

Orac10

SYS

系统管理员

ABC

ABCA

BBBB

我的输出应转换为以下内容：

甲骨文，ORAC，Orac10

SYS，系统管理员

ABC，ABCA

BBBB

Answer 1

使用awk：

awk '{key=substr($0,1,3)} key!=pkey{if (NR>1) print s; s=$0; pkey=key;next}
     {s=s "," $0} END{print s}' file
Oracle,Orac,Orac10
Sys,Sysadmin
abc,abca
bbbb

<强>解释

key=substr($0,1,3)    # extract first 3 chars of each line and store in variable key
key!=pkey {           # if previous key (pkey) is != current key then execute
  if (NR>1) print s   # for record>1 print aggregated string s
  s=$0                # reset s by storing current line in variable s
  pkey=key            # store current key in a variable pkey
  next                # move to next line
}                     # end of key!=pkey block
{s=s "," $0}          # append current line in var s after a comma
END{print s}          # print s last time