#!/bin/bash

find "$1" ! -type d |
while read fpath; do
    fname="${fpath##*/}"
    suffix="${fname##*.}"

    if [[ "$suffix" == "$fname" ]]; then
        suffix="(none)"
    fi

    size="$( stat --format '%s' "$fpath" )"

    printf '%s\t%d\n' "$suffix" "$size"
done |
awk '{ sz[$1] += $2 }
     END { for (s in sz) { printf("%s: %d\n", s, sz[s]) } }'

Given a directory on the command line, the above bash script will use stat¹ to get the size of each individual file in the directory, and below, in bytes. The while-loop also chops off the suffix for each file and outputs it together with the size of the file (in bytes).

The awk script² at the end will summarize and print the information.

Example, running over a directory of one of my work projects:

$ bash ./script.sh /home/kk/Work/Development/project/src/
c: 4559172
am: 369
h: 151369
o: 4613432
in: 42216
out: 3282712
(none): 2908962
Po: 18414
txt: 7129

The output may then be further filtered and formatted if need be.

Modifying this to do percentages of total size, or to use file to get the filetype rather than relying on the filename suffix, or to output the sizes in another unit than bytes, is left to the reader as on exercise.

¹ _{The stat call here tailored for stat on an Ubuntu machine. I don't know if stat on other Linuxes are different, but stat on OpenBSD is totally different.}

² _{The awk script is assumed to be run by an awk implementation that knows about associative arrays, such as GNU awk or mawk.}

#!/bin/bash

find "$1" ! -type d |
while read fpath; do
    fname="${fpath##*/}"
    suffix="${fname##*.}"

    if [[ "$suffix" == "$fname" ]]; then
        suffix="(none)"
    fi

    size="$( stat --format '%s' "$fpath" )"

    printf '%s\t%d\n' "$suffix" "$size"
done |
awk '{ sz[$1] += $2 }
     END { for (s in sz) { printf("%s:\t%d\n", s, sz[s]) } }'

Given a directory on the command line, the above bash script will use stat¹ to get the size of each individual file in the directory, and below, in bytes. The while-loop also chops off the suffix for each file and outputs it together with the size of the file (in bytes).

The awk script² at the end will summarize and print the information.

Example, running over a directory of one of my work projects:

$ bash ./script.sh /home/kk/Work/Development/project/src/
c:      4559172
am:     369
h:      151369
o:      4613432
in:     42216
out:    3282712
(none): 2908962
Po:     18414
txt:    7129

The output may then be further filtered and formatted if need be.

Modifying this to do percentages of total size, or to use file to get the filetype rather than relying on the filename suffix, or to output the sizes in another unit than bytes, is left to the reader as on exercise.

¹ _{The stat call here is tailored for GNU stat from the GNU coreutils package. The stat on OpenBSD is totally different.}

² _{The awk script is assumed to be run by an awk implementation that knows about associative arrays, such as GNU awk or mawk.}

#!/bin/bash

find "$1" ! -type d |
while read fpath; do
    fname="${fpath##*/}"
    suffix="${fname##*.}"

    if [[ "$suffix" == "$fname" ]]; then
        suffix="(none)"
    fi

    size="$( stat --format '%s' "$fpath" )"

    printf '%s\t%d\n' "$suffix" "$size"
done |
awk '{ sz[$1] += $2 }
     END { for (s in sz) { printf("%s: %d\n", s, sz[s]) } }'

Given a directory on the command line, the above bash script will use stat¹ to get the size of each individual file in the directory, and below, in bytes. The while-loop also chops off the suffix for each file and outputs it together with the size of the file (in bytes).

The awk script² at the end will summarize and print the information.

Example, running over a directory of one of my work projects:

$ bash ./script.sh /home/kk/Work/Development/project/src/
c: 4559172
am: 369
h: 151369
o: 4613432
in: 42216
out: 3282712
(none): 2908962
Po: 18414
txt: 7129

The output may then be further filtered and formatted if need be.

¹ _{The stat call here tailored for stat on an Ubuntu machine. I don't know if stat on other Linuxes are different, but stat on OpenBSD is totally different.}

² _{The awk script is assumed to be run by an awk implementation that knows about associative arrays, such as GNU awk or mawk.}

#!/bin/bash

find "$1" ! -type d |
while read fpath; do
    fname="${fpath##*/}"
    suffix="${fname##*.}"

    if [[ "$suffix" == "$fname" ]]; then
        suffix="(none)"
    fi

    size="$( stat --format '%s' "$fpath" )"

    printf '%s\t%d\n' "$suffix" "$size"
done |
awk '{ sz[$1] += $2 }
     END { for (s in sz) { printf("%s: %d\n", s, sz[s]) } }'

Given a directory on the command line, the above bash script will use stat¹ to get the size of each individual file in the directory, and below, in bytes. The while-loop also chops off the suffix for each file and outputs it together with the size of the file (in bytes).

The awk script² at the end will summarize and print the information.

Example, running over a directory of one of my work projects:

$ bash ./script.sh /home/kk/Work/Development/project/src/
c: 4559172
am: 369
h: 151369
o: 4613432
in: 42216
out: 3282712
(none): 2908962
Po: 18414
txt: 7129

The output may then be further filtered and formatted if need be.

Modifying this to do percentages of total size, or to use file to get the filetype rather than relying on the filename suffix, or to output the sizes in another unit than bytes, is left to the reader as on exercise.

¹ _{The stat call here tailored for stat on an Ubuntu machine. I don't know if stat on other Linuxes are different, but stat on OpenBSD is totally different.}

² _{The awk script is assumed to be run by an awk implementation that knows about associative arrays, such as GNU awk or mawk.}