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Conditional deletion of files based on extension

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Top Forums Shell Programming and Scripting Conditional deletion of files based on extension
# 1  
Old 10-29-2015
Apple Conditional deletion of files based on extension
Hello All,

I have some files like file, file.chk, file.sem and file.temp in huge. I would like to delete some files based on following criteria.

1. Unconditionally delete .sem and .temp files
2. If we found the actual file, don't remove .chk file, otherwise remove .chk file as well

for example I have:
Code:
file1.20150912.001
file1.20150912.001.chk
file2.20150913.002.sem
file2.20150913.002.temp
file3.20150914.003.chk
file4.20150914.004
file4.20150914.004.chk
file4.20150914.004.sem
file4.20150914.004.temp
file5.20150915.005.sem
file6.20150916.006.temp
file7.20150917.007

I should straight a way delete following files:
Code:
file2.20150913.002.sem
file2.20150913.002.temp
file3.20150914.003.chk
file4.20150914.004.sem
file4.20150914.004.temp
file5.20150915.005.sem
file6.20150916.006.temp

Should NOT delete following files.
Code:
file1.20150912.001
file1.20150912.001.chk
file4.20150914.004
file4.20150914.004.chk
file7.20150917.007

for this I have write the script as following:

Code:
#!/bin/bash
cd /apps/NAS/it/phome
find ./*/in -type f \( -name '*.sem' -o -name '*.temp' \) |
while read -r dfile
do
        echo rm -f "$dfile"
        CHK=${dfile/.sem/.chk}
        FILE=${dfile%.*}
        [ -f "$CHK" ] && [ ! -f "$FILE" ] && echo rm -f "$CHK"
done

But no luck, its not deleting .chk files. Could you please help me to fix if there is any issue in my above code?
Thanks in advance, appreciate your patience.
Vasu
Last edited by VasuKukkapalli; 10-29-2015 at 03:10 PM..
# 2  
Old 10-29-2015
How can it construct file3.20150914.003.chk when there is no file3.20150914.003.sem?
I suggest you have a separate loop for the .chk files.
# 3  
Old 10-29-2015
I don't understand the 2nd requirement.
Quote:
Originally Posted by VasuKukkapalli
If we found the actual file, don't remove .chk file, otherwise remove .chk file as well
What is the actual file in the above quote that determines whether or not the .chk file is supposed to be removed.

With files with names like:
Code:
base
base.chk
base.sem
base.temp

it looks like your current code will remove base.sem and base.temp unconditionally, and will remove base.chk if and only if base.sem existed and base does not exist.

If you want to remove base.chk if an only if base does not exist (in addition to removing base.sem and base.chk), try something more like:
Code:
#!/bin/bash
cd /apps/NAS/it/phome
find ./*/in -type f \( -name '*.sem' -o -name '*.temp' -o -name '*.chk' \) |
while read -r dfile
do	case "$dfile" in
	(*.sem|*.temp)	echo rm -f "$dfile";;
	(*.chk)		FILE=${dfile%.*}
			[ ! -f "$FILE" ] && echo rm -f "$dfile";;
	esac
done

NOTE: -o added before -name '*.chk' as suggested by MadeInGermany in post #5 in this thread.
Last edited by Don Cragun; 10-29-2015 at 05:17 PM.. Reason: Add missing -o.
These 2 Users Gave Thanks to Don Cragun For This Post:
RavinderSingh13 VasuKukkapalli
# 4  
Old 10-29-2015
I am sorry for the typo Don, If actual file present, don't remove .chk file, if the actual file not present, remove the .chk file

for example, if i have file1, file1.chk, file2, file3.chk, in that case, remove only file3.chk.

Hope this clarifies.
# 5  
Old 10-29-2015
Don, your find is missing a -o
--
With separate finds; the first rm can be efficiently handled within the find:
Code:
...
find ./*/in -type f \( -name '*.sem' -o -name '*.temp' \) -exec echo rm -f {} +
find ./*/in -type f \( -name '*.chk' \) |
while read -r dfile
do
    FILE=${dfile%.*}
    [ ! -f "$FILE" ] && echo rm -f "$dfile"
done

This User Gave Thanks to MadeInGermany For This Post:
Don Cragun
# 6  
Old 10-29-2015
Thank you So much Don, Its working now!
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