sed command match line operation

#View the line before the matched line

cat  file.txt  |grep '5' -B1

#View the next two lines that match the line

cat  file.txt  |grep '5' -A2

#View two lines before and after the matched line

cat  file.txt  |grep '5' -C2

#View the content between two strings (only valid in one line)

cat file.txt
<python>123456789</python>

cat file.txt | grep -E "<python>.*</python>" | awk '{t=$0;gsub(/.*<python>|<\/python>.*/,"",t);print t}' > new_file.txt

cat new_file.txt
123456789

#View the content between two strings (valid in multiple lines)

cat file.txt
begin ok start
1,2
4
67
stop end ok

#想要 begin ok 到 end ok 之间的内容
#!/bin/sh
begin_num=`cat -n  file.txt|grep -rin 'begin ok' file.txt|awk -F : '{print $1}'`
begin_string=`cat -n  file.txt|grep -rin 'begin ok' file.txt|awk -F : '{print $2}'`
begin_add1_num=$(($begin_num+1))
end_num=`cat -n  file.txt|grep -rin 'end ok' file.txt|awk -F : '{print $1}'`
end_string=`cat -n  file.txt|grep -rin 'end ok' file.txt|awk -F : '{print $2}'`
end_add1_num=$(($end_num-1 ))
 #Cut 
the string after the first begin ok from left to right echo $ {begin_string # * begin ok}   
 sed -n " $ {begin_add1_num}, $ {end_add1_num} p "  file .txt #From 
right to left Intercept the first / after string
 echo $ {end_string% end ok *}

result:

start
1,2
4
67
stop

#Delete a piece of content in the file

#!/bin/sh
while read line
 do
  echo "${line}"
  #指定行号
  para_num=`grep -rin "${line}" file.txt|awk -F ":" '{print $1}'`
  echo "参数指定行：${para_num}"
  para_up_num=$((${para_num}-2))
  para_dow_num=$((${para_num}+2))
  echo ${para_up_num} ${para_dow_num}
  sed -i "$ {para_up_num}, $ {para_dow_num} d "  file .txt
  done   < config.conf 
 
echo  " all tables are processed " #Description 
: Try to be unique in the configuration file config.conf, only one line can be configured in the file


#Modify a specified line of content in the file

#! / bin / sh 
while read line
  do 
  echo  " $ {line} " 
  para_old = ` grep -ri " $ {line} "  file .txt` #Specify the 
  line number 
  para_num =` grep -rin " $ {line} "  file .txt | awk -F " : "  ' {print $ 1} ' `
   echo  " Parameter specification line: $ {para_num} " 
  echo  " The parameter value before replacement: $ {para_old} " 
  para_1 = "<para>" 
  para_2 = " \ $ (bizDate) 1 \ "SUBSTR (DEFAULT_DT, 1,4) || SUBSTR (DEFAULT_DT, 6,2) || SUBSTR (DEFAULT_DT, 9,2) \" null \ $ (bizDate) </ para> " 
  para_new = " $ {para_1} $ {line} $ {para_2} " 
  sed -i " $ {para_num} c $ {para_new} "  file .txt
   echo  " The parameter value after replacement: $ {para_new} " 
 done   < config.conf 
 
echo  " All tables are processed " #Description
 
: Try to be as unique as possible in the configuration file config.conf. Only one line can be configured in the file, where para_1 and para_2 are the contents of this line

sed command match line operation

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