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Shell Programming and Scripting

Conditional delete

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# 29  
Old 08-30-2018
Quote:
Originally Posted by RudiC
Did you read and understand Don Cragun's post#4?






Understood - I wasn't sure stat's output would be sorted although the shell expands / presents the file names sorted.





The proposal (as mainly all of my proposals) is to be read as a "proof of concept" and not as a "turnkey system". It does NOT relieve the user of developing a deep understanding and thoroughly checking / testing / adapting it before applying to real world - even less to production - systems. Please adapt to your needs, e.g. by reading, understanding, and applying other posts in this thread.
Hi RudiC/Don Cragun ,

I tested it successfully the below code by piping to sh (thanks to Post no 4 and googled and understood it), its deleting right files and keeping latest one and deleting rest till its get the space to 60 % Smilie Thank you all who ever replied on this post..
Code:
{ cd /home/asp; stat -fc"%b %a %S" .; stat -c"%n %b %B" 2018*.tar.gz | sort; } | awk '
NR == 1         {Needed = ($1 * PCT - $2) * $3
                 next
                }

                {split ($1, T, "_")
                 if (T[1] == KnownTime)
                    {print "rm " LastFile
                    SUM += $2 * $3
                    if (SUM >= Needed) exit
                    }
                 KnownTime = T[1]
                 LastFile = $1
                }
' PCT=0.4  |sh

[asp@abcsd34 ~]$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1        40G   24G   17G  60% /
devtmpfs        1.9G     0  1.9G   0% /dev
tmpfs           1.9G     0  1.9G   0% /dev/shm
tmpfs           1.9G   18M  1.9G   1% /run
tmpfs           1.9G     0  1.9G   0% /sys/fs/cgroup
tmpfs           377M     0  377M   0% /run/user/1000

I m considering to add additional functionality(is this correct way)

Code:
find /path/to -type f -mtime +30 -exec rm {} \;

as we don't need any file before 30 days from sysdate, however i could not test as sample files i have created have same timestamp(real timestamp not the fine name though)


Hi

it was working on some systems..But now on a particular machine it s saying cannot remove file no such file or directory...even though file is there. I am not sure if its complain about space in file name, but when i put only echo its showing file names...

Code:
{ cd /home/asp; stat -fc"%b %a %S" .; stat -c"%n %b %B" 2018*.tar.gz | sort; } | awk '
NR == 1         {Needed = ($1 * PCT - $2) * $3
                 next
                }

                {split ($1, T, "_")
                 if (T[1] == KnownTime)
                    {print "rm " LastFile
                    SUM += $2 * $3
                    if (SUM >= Needed) exit
                    }
                 KnownTime = T[1]
                 LastFile = $1
                }
' PCT=0.4  |sh

Last edited by onenessboy; 10-03-2018 at 05:03 AM..
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