Top Linux Basic Command

1.  To grep the pattern using awk command:

               awk '{print $1,$2,$3,$4,$5,$6,$7}' <file_name> | sort | uniq -c | sort -nr | grep <pattern>

2. To grep the pattern from zipped(*.gz) file using awk command:

                  awk '{print $1,$2,$3 }' <(gzip -dc <zipped_file_name>) | sort uniq -c | sort -nr | grep <pattern>

3. Copy the file from one server to another:

            scp -r root@10.200.134.243:/<source-path> root@10.200.134.195:/<destination-path>

4. To monitor the log:

                tail –f  /var/log/atg/server.log

              

5. To find string the directory:

                grep -nr "string"  <my_directory>

6. To find directory from the sub directory:

            find -type d -name ‘my_directory’

7. To find the file from the sub directory:

            find -type f -name ‘my_file’

8. To find the site response time :

             curl -s -w %{time_total}\\n -o /dev/null <URL>

9. upload file using cURL command

        curl –u ftpusername:ftppassword –T “{file1.txt, file2.txt,file3.txt…}” <url where to upload>

10. To unzip  the zipped file to the specific path :

               unzip *.zip -d /destination path

11. To replace the string to another string in a file in vi mode: 

       Follow the following steps:

                a) vi <file name>

               b) esc + :%s/<old_string>/<new_string>/+ press enter

               c) esc + wq+ enter ==> to save

12: Read the data one by one row wise from csv file:

           while read p;

              do

                   if [ ! -z "$p" -a "$p" != " " ]; then

                       IP=`echo $p | cut -d',' -f1`

                       PORT=`echo $p | cut -d',' -f2`

                      

                       echo "ip= $IP, Port= $PORT"

                   fi

              done < IP_PORT.csv

13.  Remove the pattern for the given specific condition :

           if two pattern should not be in same row, delete it. like pattern1 and pattern2 or pattern2 and pattern3 should not be together etc.

                sed -i "/<pattern1> <pattern2>\|<patten2><pattern3>/d" <file_name>

14. If line contains the specific pattern, delete the line from file using sed command: 

              sed -i '/172.*/!d' netstat_20161230.log

    

15. To replace the file path with another file path using sed command:

            sed -i 's#/srvrs/ag/asapprd1/#/u01/ag/asapprd1/ASAP/#g' /<file_name>

16. To replace the pattern with another pattern in a file using sed command:

             

              sed -i "s/<pattern1>/<pattern2>/g" <file_name>