How to change date format in linux/unix text file

Question

I have sample.txt file in my linux system.all the data that is present in my file are in the following date format I want to convert all this date format in my sample.txt file to YYYY-MM-DD Format. Answer It's quite simple with date -d, e.g. Input File Example Use/Output

Accepted Answer

It&#8217;s quite simple with date -d, e.g.while read -r line; do     echo $(date -d "$line" +%Y-%m-%d); done < file.txtInput File$ cat file.txt            Mon Apr 24 16:14:06 PDT 2017            Tue Apr 25 13:31:25 PDT 2017            Mon Apr 03 13:53:03 PDT 2017            Sun Feb 05 16:19:27 PST 2017            Sun Feb 05 17:51:42 PST 2017            Sun Feb 05 18:16:21 PST 2017            Sun Feb 05 19:17:33 PST 2017            Sun Feb 05 21:14:23 PST 2017            Sat Feb 04 10:39:33 PST 2017            Sat Feb 04 10:46:52 PST 2017            Sat Feb 04 14:35:27 PST 2017Example Use/Output$ while read -r line; do echo $(date -d "$line" +%Y-%m-%d); done < file.txt2017-04-242017-04-252017-04-032017-02-052017-02-052017-02-052017-02-052017-02-052017-02-042017-02-042017-02-04

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