Shell Programming and Scripting

awk '{c[$1]++} END {for(k in c} print k "\t\t" c[k ];}' file_name | sort -nrk 2 | column -t

$ cut -d" " -f1 file_name|sort|uniq -c|sed 's/ *\(.*\) \(.*\)/\2  \1/'

[ cut -f1 -d' ' file_name | sort |uniq -c | sort -nr ]

[ cut -f1 -d' ' file_name | uniq -c | sort -nr ]

# cat file
a b
b c
a b
d c
a b
a b

# cut -f1 -d' ' file|uniq -c
      1 a
      1 b
      1 a
      1 d
      2 a

# cut -f1 -d' ' file|uniq -c|sort
      1 a
      1 a
      1 b
      1 d
      2 a

# cut -f1 -d' ' file|sort
a
a
a
a
b
d

# cut -f1 -d' ' file|sort|uniq -c
      4 a
      1 b
      1 d

# sed 's/ *\(.*\) \(.*\)/\2  \1/'

"      "4 a
"      "1 b
"      "1 d

# cut -f1 -d' ' file |sort|uniq -c|sed 's/ *\(.*\) \(.*\)/\2 \1/'
a  4
b  1
d  1