transpose-file.sh

# Time:  O(n^2)
# Space: O(n^2)
#
# Given a text file file.txt, transpose its content.
# 
# You may assume that each row has the same number of 
# columns and each field is separated by the ' ' character.
#
# For example, if file.txt has the following content:
#
# name age
# alice 21
# ryan 30
# Output the following:
# 
# name alice ryan
# age 21 30
#

# Read from the file file.txt and print its transposed content to stdout.
awk '
{
    for (i = 1; i <= NF; i++) {
        if(NR == 1) {
            s[i] = $i;
        } else {
            s[i] = s[i] " " $i;
        }
    }
}
END {
    for (i = 1; s[i] != ""; i++) {
        print s[i];
    }
}' file.txt