How to add text at the end of each line in unix

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There are many ways:

sed: replace $ (end of line) with the given text.

$ sed 's/$/ | COUNTRY/' file
india | COUNTRY
sudan | COUNTRY
japan | COUNTRY
france | COUNTRY

awk: print the line plus the given text.

$ awk '{print $0, "| COUNTRY"}' file
india | COUNTRY
sudan | COUNTRY
japan | COUNTRY
france | COUNTRY

Finally, in pure bash: read line by line and print it together with the given text. Note this is discouraged as explained in Why is using a shell loop to process text considered bad practice?

$ while IFS= read -r line; do echo "$line | COUNTRY"; done < file
india | COUNTRY
sudan | COUNTRY
japan | COUNTRY
france | COUNTRY

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