Whether the recording command is a command to determine the value md5 modified

scenes to be used:

After the operating system installation is complete, execute the following script, record the md5 command value, when the command is modified using the script again to check it out.

Record location for the user's home directory the following .UserCheckCom.txt file (there is a point, is a hidden file, note)

Instructions:

1. Record the current command:
sh CheckCommDDCW.sh
2. Add command or a recording command to modify (add keyword can be replaced by any non-empty string):
sh CheckCommDDCW.sh add

code show as below:

git Download: https://codeload.github.com/ddcw/shell/zip/master

#!/bin/env bash
#write by ddcw
#https://cloud.tencent.com/developer/column/6121
#scriptname:CheckCommDDCW.sh
begintime=`date +%s`
file_name=~/.UserCheckCom.txt
new_comm_n=0
change_comm_n=0
new_comm=""
change_comm=""
[ -f ${file_name} ] || touch ${file_name}
for i in $(compgen -c)
do
    if which $i >/dev/null  2>&1 
    then
        md5_n=$(md5sum $(which $i) | awk '{print $1}')
        if  cat ${file_name} | grep "\#$i\#" >/dev/null  2>&1 
        then
        #   echo $(cat ${file_name} | grep "\#$i\#")
            md5_o=$(cat ${file_name} | grep "\#$i\#" | tail -1 | awk '{print $NF}')
            if [ "${md5_n}" != "${md5_o}" ]
            then
                #echo -e "COMMD \033[1;41;33m $i \033[0m may be Changed: old_MD5: ${md5_o}    new_MD5: ${md5_n}"
                [ -z $1 ] || echo -e "#${i}# \t $(date +%Y%m%d-%H:%M:%S) \t ${md5_n}" >> ${file_name}
                change_comm_n=$[ ${change_comm_n} + 1]
                change_comm="${change_comm}  ${i}"
            fi
        else
            if [ "${i}" != '[' ]
            then
                new_comm_n=$[ ${new_comm_n} + 1]
                new_comm="${new_comm}  ${i}"
                #echo -e "\033[32;40m$i \033[0m"
                echo -e "#${i}# \t $(date +%Y%m%d-%H:%M:%S) \t ${md5_n}" >> ${file_name}
            fi
        fi
    fi  
done
echo ""
if [ ${new_comm_n} -gt 0 ]
then
    echo -e "\033[31;40m Total Add  ${new_comm_n} commd \033[0m"
    echo "${new_comm}"
else
    echo -e "\033[32;40m No Command  Added ,It's Seccurity!\033[0m\n"
fi
if [ ${change_comm_n} -gt 0 ]
then
    echo -e "\033[31;40m Total Changed  ${change_comm_n} commd \033[0m"
    echo "${change_comm}"
else
    echo -e "\033[32;40m No Command Changed  ,It's Seccurity!\033[0m"
fi
endtime=`date +%s`
costm=`echo ${begintime} ${endtime} | awk '{print ($2-$1)/60}'`
echo -e "\n\033[32;40m `date +%Y%m%d-%H:%M:%S` cost ${costm} minutes\033[0m"