The last article 《grep or condition, grep and condition》 introduced grep and, or use, including the use of the -e parameter.
Here is a detailed description of the use of the -e parameter.
grep one pattern
➜ grep -e "12" test1.txt
➜ grep "12" test1.txt The results are consistent.
grep two patterns
➜ grep -e "12" -e "linux" test1.txt
grep three patterns
➜ grep -e "12" -e "linux" -e "apple" test1.txt
Multiple patterns and so on.
Grep and condition can also use grep -e parameter.