CODEWITHSUNDEEP
shellunixsh
panbar
panbar

Reputation: 95

for loop in shell taking input from column name of a tab delimited file

I want to perform a iterative task on a bunch of similar files with similar partial files names contain "{$ID}". The program is running for each of the separate files manually. I wanted to write a for loop in shell to take 'ID' from a txt file and do the task. I am unable to give the input argument ID in the for loop from the values in coloumn1 of test.txt file Eaxmple:

for ID in 'values in coloumn1 of test.txt file' 
  do
    file1=xyz_{$ID}.txt
    file2=abc_{$ID}.txt
    execute the defined function using file1 and file2 
    write to > out_{$ID}.txt
 done

Upvotes: 1

Views: 365

Answers (1)

chepner
chepner

Reputation: 531808

Iterate over the file with a while loop, letting read both input a line from the file and splitting the first column off each line.

while read -r ID rest; do
    ...
done < test.txt

If the columns are delimited by a character other than whitespace, use IFS to specify that single character.

# comma-delimited files
while IFS=, read -r ID rest; do
    ...
done < test.txt

Upvotes: 1

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