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I want to create a shell script that will count files (1 hr older files) and if files are more than 1000, then delete all.

For read and delete I am using those command at putty

for count:

ls /tmp/ | grep 'ci_session*' | wc -l

for Delete files:

cd /tmp/
find . -name "ci_session*" -exec rm ;

#Update: for delete, i want to delete only 1 hr older files.

Here I want to add condition if total files are greater than 1000, then call delete command.

I interpreted your question as "How may I count the files, and if there are more than 1000, delete the ones that are older than one hour?".

Counting the names matching /tmp/ci_session* and doing something when there's more than 1000 of them:

set -- /tmp/ci_session*
if [ "$#" -gt 1000 ]; then
 # something
fi

This sets the positional parameters to the names matching the pattern. The special variable $# then contains the number of positional parameters.

Deleting the files matching /tmp/ci_session* if their last modified time is more than an hour ago:

find /tmp -maxdepth 1 -type f -name 'ci_session*' -mmin +60 -delete

Taken together:

#!/bin/sh

set -- /tmp/ci_session*
if [ "$#" -gt 1000 ]; then
 find /tmp -maxdepth 1 -type f -name 'ci_session*' -mmin +60 -delete
fi

The only thing to note here is that the count will be of any name matching the pattern (even of directory names, if there are any), while the find command will restrict the deletion to only regular files (i.e. not directories).

As long as your find has an -mmin option you can do:

Using a shell script:

#!/bin/sh

files_dir=/tmp
file_count=$(find "$files_dir" -name 'ci_session*' -mmin 60 -exec echo x ; | wc -l)

if [ "$file_count" -gt 1000 ]; then
 find "$files_dir" -name 'ci_session*' -mmin 60 -exec rm ;
fi

file_count will be set to the number of files found in the specified directory matching the pattern.

If file_count is greater than 1000 we will run find again and delete those files.

Using bash we can eliminate the second call to find with an array:

#!/bin/bash

files_dir=/tmp
mapfile -t files < <(find "$files_dir" -name 'ci_session*' -mmin 60)

if (($#files[@]>1000)); then
 rm "$files[@]"
fi

Note: depending on how many files you expect to have the bash solution may run into your command line argument limit.