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This is my Linux script, I want to ask the user from outside what date is needed, then save that date and run the script for that date.

#/bin/bash cDt=$(date +"%Y%m%d") cd /home/dwh_landing/temp echo 'Process_Date,Outfile,Outpath,Process_hour,Process_Minutes,Infile' > ccn_daily_${cDt}.csv cd /home/dwh_landing/etl_scripts/etl_logs/ awk -F',' '{print $1 "," $2 "," $5}' *ccn-json*${cDt}* | grep 'creditControl.json' | awk -F '/' '{print $0 "," $5}' | awk 'match($0, /(\s\S*k)/ , a ) {print $0 "," a[1]}' >> /home/dwh_landing/temp/ccn_daily_${cDt}.csv cd /home/dwh_landing/temp cat ccn_daily_${cDt}.csv | wc -l >> ccn_daily_${cDt}.csv

now currently this script generate a csv for the current date files, I want to run this for a user request date, can I pass parameters from outside? any help could be useful.

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2 Answers 2

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YOu can use a while loop to read a date off the user until the date is compliant (date returns a code 0) at which point we break from the loop and execute your script (in this case myscript), passing the read date variable dat as a parameter:

while true; do read -p "Please enter a date in the format i.e. 20210201" dat; if date -d "$dat" +"%Y%m%d"; then break; fi; done myscript "$dat"

Then in your script, amend the line:

cDt=$(date +"%Y%m%d")

to:

cDt="$1" # SEt cDt to the first passed parameter
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1 Comment

I'd recommend while true; do read -p "..." dat; userDate=$(date -d "$dat" "+%Y%m%d") && break; done; do_stuff_with "$userDate" -- that way, the user can enter the date in any (valid) format, and the script can use the ISO date format for whatever it needs.
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What do you mean by outside? Do you want to pass parameters when running the script? If so, you can run the script with

./myscript $(date +"%Y%m%d")

and use this argument with

#!/bin/bash cDt="$1" ...

This is parameter number one, since the null parameter is the name of the script.

Also, you can validate a date string with

if ! date +"%Y%m%d" -d "$cDt" &> /dev/null; then echo "$1 - invalid date string" exit fi
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4 Comments

this script finds the files for the current date and executes(generate ) a csv for the current date. example file_20210201<file name>, I want to generate the files for a random date example: genate the csv for the date 2021-01-27 then it should takes files on the day 27 january not the current date
possibility to pass the date suffix from outside as a parameter to script
If I understood you correctly, then the answer contains the solution to your question. The only thing I have not specified is a check that this argument exists at all. You can do it with if [[ -z "$1" ]]; then echo "no parameters"; exit; fi.
You can pass the argument without date e.g. ./myscript 20210127. To use a different date format, you can change the validation string

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