From https://wiki.vip.corp.ebay.com/display/unix0hawk/Classic+Cases#

hawk_classic.sh

1 Kill the Processes Clearly We always met the case to kill a group processes without affecting others belong to the same user.     1.1 kill the processes which are the child process of a target PID                               kill -9 -<pid>  Notes: It is recommended that you start a new connection to the server and execute the command with possible exception,                which provide a new process group and the above command would not affect others.     1.2 kill all of the processes belong to the same user:                 pkill -9 -U <username>     2 Using find find is a very strong command on Unix Platform, and it is more strong on Linux.  2.1 Find all of files whose name like "*.sql" or like "*.SQL" or like "*.sh"                 find . -type f -name "*.sql" -o -name "*.SQL" -o -name "*.sh"  2.2 Find all of files with size more/less than 1024 and modified more / less than one week(7 days):                 find . -type f -size +1024 -ctime +7                  find . -type f -size -1024 -ctime -7                 2.3 Find all of executable files which contains some strings                 find <dir name> -type f  -perm -500 -exec grep -in "kkkk" {} \;  Notes: Don't forget "\;" at the end of the commands.     3 Pattern Matching with awk/nawk There are a lot of cases related to pattern matching with awk. While, on Solaris, the strong version of awk is nawk.  3.1 Supposed that data file is separated by '|', the following command give all of rows whose last field contain the string "KKKK" by case sensitive                 nawk -F \| '{if( toupper($(NF)) ~ /KKKK/ ){print NR, ":", $0;}}' <target file name>  3.2 List all of the processes whose command contain the string "tpt" by case sensitive                 ps -ef | nawk '{if( tolower($(NF)) ~ /tpt/ ){print $0;}}'  3.3 Rename many files whose name have the same pattern                find . -type f -name "*PPPP" | nawk '{srcname=$1; newname=$1; gsub("PPPP","", newname);scmd=" mv " srcname " " newname; print scmd;}'                 find . -type f -name "*PPPP" | nawk '{srcname=$1; newname=$1; gsub("PPPP","XXXX", newname);scmd=" mv " srcname " " newname; print scmd;}'  *print and execute:                 find . -type f -name "*PPPP" | nawk '{srcname=$1; newname=$1; gsub("PPPP","", newname);scmd=" mv " srcname " " newname; print scmd; system(scmd); } '                 find . -type f -name "*PPPP" | nawk '{srcname=$1; newname=$1; gsub("PPPP","XXXX", newname);scmd=" mv " srcname " " newname; print scmd; system(scmd); } '