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# 1  
Old 12-18-2007
Change date format

I know the command date +"%Y%m%d" can change today's date to digit format as below .

$date +"%Y%m%d"

it works fine .

now I want to do it back . If I have a file like below, (in the file , there are three lines, and each line have ; sign , after the ; sign is the date ) , I want to change the date of the first line to the format Dec 17 , can advise what can i do ? thx

$vi myfile
# 2  
Old 12-18-2007
Here is an example awk script which should help you achieve what you want to do

    months = "Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec"
    split(months, month, ",")
    FS = ";"

$2 != "" {
    y = substr($2,1,4)
    m = substr($2,5,2)
    m+= 0
    d = substr($2,7,2)
    d+= 0
    printf "%s %d, %s\n", month[m], d, y

# 3  
Old 12-19-2007
If you are looking for something that works like the date command but on arbitrary dates: there is no such thing, at least not to my knowledge.

You can emulate dates behavior, though, fpmurphy has already shown you how. There are equivalent ways to achieve the same in shell script languages.

# 4  
Old 12-19-2007
best way is to parse it. if each field after the ; is exactly the same width - ie; first 4 digits are the year, next 2 digits are the month, and last 2 digits are the day, then it will be quite easy for you to convert with awk, or with a cut + date + case.

the last field may pose you issues though: 20071254
# 5  
Old 12-19-2007
Originally Posted by idle
the last field may pose you issues though: 20071254
Man - December is going to be a long month this year!

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