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  1. set -x
  2.  
  3. oldname='The New Town Cryer - 01 Oct 2020.pdf'
  4. date_re='(^.*) - ([[:digit:]]{2}) ([[:alpha:]]+) ([[:digit:]]{4})(.*)'
  5. if [[ $oldname =~ $date_re ]]; then
  6.   basename=${BASH_REMATCH[1]}
  7.   day=${BASH_REMATCH[2]}
  8.   month=${BASH_REMATCH[3]}
  9.   year=${BASH_REMATCH[4]}
  10.   ext=${BASH_REMATCH[5]}
  11.   new_date=$(date -d "${day} ${month} ${year}" +%Y-%m-%d)
  12.   newname="${new_date} - ${basename}${ext}"
  13.   echo "Old name: $oldname"
  14.   echo "New name: $newname"
  15. fi
  16.  
Success #stdin #stdout #stderr 0s 4556KB
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stdin
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Standard input is empty
stdout
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Old name: The New Town Cryer - 01 Oct 2020.pdf
New name: 2020-10-01 - The New Town Cryer.pdf
stderr
copy 
+ oldname='The New Town Cryer - 01 Oct 2020.pdf'
+ date_re='(^.*) - ([[:digit:]]{2}) ([[:alpha:]]+) ([[:digit:]]{4})(.*)'
+ [[ The New Town Cryer - 01 Oct 2020.pdf =~ (^.*) - ([[:digit:]]{2}) ([[:alpha:]]+) ([[:digit:]]{4})(.*) ]]
+ basename='The New Town Cryer'
+ day=01
+ month=Oct
+ year=2020
+ ext=.pdf
++ date -d '01 Oct 2020' +%Y-%m-%d
+ new_date=2020-10-01
+ newname='2020-10-01 - The New Town Cryer.pdf'
+ echo 'Old name: The New Town Cryer - 01 Oct 2020.pdf'
+ echo 'New name: 2020-10-01 - The New Town Cryer.pdf'
https://ideone.com/Suw9Ow
language:
Bash (bash 5.0.3)
created:
5 years ago
visibility:
public

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