Creating a shell script to pull selected data from a file - bash

Question

I'm trying to create a shell script in Linux to accept only 2 arguments for the date and one for the time (while at the same time accepting am/pm)
Here's one of the scripts I attempted to write up.
#!/bin/bash
date=$1
space=" "
time=$2
ampm=$3
timeampm=$2$space$3
print("date $1")
print("time $2")
print("ampm $3")
print("timeampm $timeampm")
Heres the file I'm going off
0310 02:00:00 AM Abigale Rich
0310 05:00:00 AM Billy Jones
0310 08:00:00 AM Billy Jones
0310 11:00:00 AM Summer-Louise Hammond
0310 02:00:00 PM Billy Jones
0310 05:00:00 PM Rahima Figueroa
0310 08:00:00 PM Billy Jones
0310 11:00:00 PM Billy Jones
0312 02:00:00 AM Abigale Rich
0312 05:00:00 AM Billy Jones
0312 08:00:00 AM Billy Jones
0312 11:00:00 AM Summer-Louise Hammond
0312 02:00:00 PM Billy Jones
0312 05:00:00 PM Rahima Figueroa
0312 08:00:00 PM Billy Jones
0312 11:00:00 PM Billy Jones
0315 02:00:00 AM Abigale Rich
0315 05:00:00 AM Billy Jones
0315 08:00:00 AM Billy Jones
0315 02:00:00 PM Billy Jones
0315 05:00:00 PM Rahima Figueroa
0315 08:00:00 PM Billy Jones
For example, on line 3, I want to be able to ./scriptname.sh 0310 08:00:00 AM and it pulls out the name "Billy Jones"
I have been mostly trying to use grep, awk and sed. If you want to see my other codes I've written up, I'll add them.

Answer 1

Your script contains several syntax errors and other oddities. Perhaps you are looking for
#!/bin/bash
date=$1
time=$2
ampm=$3
timeampm="$2 $3"
echo "date $1"
echo "time $2"
echo "ampm $3"
echo "timeampm $timeampm"
sed -n "s/^$date $timeampm //p" file
which of course can be reduced to just
#!/bin/sh
sed -n "s/^$1 $2 $3 //p" file
and you can run it with sh -x if you want to see exactly what it's doing.
For robustness, maybe add some validation for the arguments, or maybe switch to Awk which has less bewildering failure modes when you pass in things in unexpected formats. Plain standard grep doesn't easily let you remove the matching text and print the rest (though if you have GNU grep, waybe try grep -Po "^$1 $2 $3 \K.*" file).
More fundamentally, perhaps your file should contain dates in a standard format. On Linux, you can ask date -d to convert a large number of date formats and other time expressions to whichever format your file uses.