date 표현

$ date -option -format

 

포맷

 

YYYYMMDD

[user@localhost 20210414]$ date +%G%m%d
20210414

 

[user@localhost 20210414]$ date +%F
2021-04-14

 

[user@localhost 20210414]$ date +%y%m%d
210414
[user@localhost 20210414]$ date +%Y%m%d
20210414

 

[user@localhost 20210414]$ touch $(date +%F).txt
[user@localhost 20210414]$ ls
2021-04-14.txt

[user@localhost 20210414]$ ls -l /etc >> ./list$(date +%G%m%d).txt
[user@localhost 20210414]$ ls
list20210414.txt

$(date)

 

 

※  `` 역 홑따옴표와 $() 달러표시

 

[user@localhost 20210414]$ echo today is `date +%Y%m%d` → 범용
today is 20210414
[user@localhost 20210414]$ echo today is $(date +%Y%m%d)  → bash 쉘에서만 가능함
today is 20210414