Is this syntactically correct for Unix Shell Script?

Question

I want to replace the 20140118 with $DATE in "Personal_20140118D_1.zip"

is "Personal_"$DATE"D_1.zip" syntactically correct?

DATE=date +%Y%m%d

if [ ( $FILE == "Personal_20140118D_1.zip" ) -a ( $TODAY == "Sat" ) ]; then

..... ... .

Aaron Digulla · Accepted Answer · 2014-01-23 12:39:53Z

1

Yes. Quotes only protect spaces from becoming word separators. You can have them in any place. So these are all equivalent as long as a and b don't contain spaces:

ab
"a"b
"a""b"
a"b"
a"$var"b
a${var}b

I suggest to use "a${var}b", though since the other forms look confusing.

answered Jan 23, 2014 at 12:39

Aaron Digulla

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l0b0 · Accepted Answer · 2014-01-23 12:40:32Z

1

To replace the first occurrence of the date in the variable:

date_file=${FILE/20140118/$DATE}

See man bash for details.

Example:

$ date=`date +%Y%m%d`
$ file="Personal_20140118D_1.zip"
$ date_file=${file/20140118/$date}
$ echo "$date_file"
Personal_20140123D_1.zip

answered Jan 23, 2014 at 12:40

l0b0

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