cut

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user@linux:~/workspace$
cut -d, -f1 data/users.csv

Explanation

Uses comma as delimiter and extracts the first field.

Options

-dSet delimiter
-fSelect fields
-cSelect characters
--complementSelect everything except specified
-bSelect bytes
1id,name,email,role,created_at
21,Alice Johnson,[email protected],admin,2025-01-15
32,Bob Smith,[email protected],user,2025-02-20
43,Carol Williams,[email protected],user,2025-03-10
54,David Brown,[email protected],moderator,2025-04-05
65,Eve Davis,[email protected],user,2025-05-12
76,Frank Miller,[email protected],user,2025-06-18
87,Grace Wilson,[email protected],admin,2025-07-22
98,Henry Taylor,[email protected],user,2025-08-30
109,Ivy Anderson,[email protected],user,2025-09-15
1110,Jack Thomas,[email protected],moderator,2025-10-01