一个替换文本文件中某一个关键字附近的某一行的某一段的shell程序：

一个替换文本文件中某一个关键字附近的某一行的某一段的shell程序：

#!/bin/bash
file=$1
findpattern=$2
linegap=$3
replacepattern=$4
substitue=$5

help(){
  echo help:
  echo \$1:file\'s full path \(include filename\)
  echo \$2:the key string to be find
  echo \$3:the line count between the line where key string in and the line to be modified
  echo \$4:the string to be replace
  echo \$5:the string will take place the key string
}

echoinput(){
  echo \$1=$file
  echo \$2=$findpattern
  echo \$3=$linegap
  echo \$4=$replacepattern
  echo \$5=$substitue
}
if [ "$5" == "" ];then
  help;
  exit -1;
fi

echoinput;

if [ ! -f ${file} ];then
  echo $file is not exist.
fi

#echo "awk '/${findpattern}/{print NR}' ${file}";
n=`awk '/'"${findpattern}"'/{print NR}' ${file}`;
if [ "$n" == "" ];then
  echo can not find ${findpattern} in ${file};
  exit -1;
fi
echo find key string in line $n;
if [ ! -n $n ];then
  echo find too much lines.
  exit -1;
fi

n2=`expr $n + ${linegap}`;
echo will modify line $n2,line contnet is:;
awk 'NR=='${n2}'{print $0}' ${file};
#echo "sed ${n2}'s/${replacepattern}/${substitue}/g' ${file} > tmp${file};"
sed ${n2}'s/'"${replacepattern}"'/'"${substitue}"'/g' ${file} > tmp${file};
diff ${file} tmp${file}

还有些bug：只能在文本文件当前目录下运行。不修改了。