Here, I am going to share a small shell utility which will ask source file name and the pattern which need to be searched in file and give the formatted output with the line no with line. You can select the no of lines which display before and after the string.
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| #!/bin/ksh | |
| echo "enter the file name" | |
| read V_file_name | |
| echo "enter the string to be searched" | |
| read V_string | |
| line_num=`grep -n "$V_string" $V_file_name|awk -F":" '{print $1}'` | |
| echo "The entered string occurs at the following line(s) in the file" | |
| echo $line_num | |
| echo "enter the required line number" | |
| read V_req_line_num | |
| echo "How many lines before and after the string would you like to be displayed ?" | |
| read V_bef_aft | |
| var_1=$(($V_bef_aft+1)) | |
| var_2=$(($V_req_line_num+$V_bef_aft)) | |
| head -$V_req_line_num $V_file_name|tail -$var_1 > req_file.txt | |
| head -$var_2 $V_file_name|tail -$V_bef_aft >> req_file.txt | |
| echo "The required text is....." | |
| cat req_file.txt |
