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#!/usr/bin/env bash

# Reads stdin and writes it to stdout centred.
#
# 1. Send stdin to a temporary file while keeping track of the maximum
#    line length that occurs in the input.  Tabs are expanded to eight
#    spaces.
# 2. When stdin is fully consumed, display the contents of the temporary
#    file, padded on the left with the apropriate number of spaces to
#    make the whole contents centred.
#
# Usage:
#
#  center [-c N] [-t dir] <data
#
# Options:
#
#   -c N    Assume a window width of N columns.
#           Defaults to the value of COLUMNS, or 80 if COLUMNS is not set.
#
#   -t dir  Use dir for temporary storage.
#           Defaults to the value of TMPDIR, or "/tmp" if TMPDIR is not set.

tmpdir="${TMPDIR:-/tmp}"
cols="${COLUMNS:-80}"

while getopts 'c:t:' opt; do
    case "$opt" in
        c)  cols="$OPTARG" ;;
        t)  tmpdir="$OPTARG" ;;
    esac
done

tmpfile="$tmpdir/center-$$.tmp"
trap 'rm -f "$tmpfile"' EXIT

while IFS= read -r line
do
    line="${line//$'\t'/        }"
    len="${#line}"
    maxlen="$(( maxlen < len ? len : maxlen ))"
    printf '%s\n' "$line"
done >"$tmpfile"

padlen="$(( maxlen < cols ? (cols - maxlen) / 2 : 0 ))"
padding="$( printf '%*s' "$padlen" "" )"

while IFS= read -r line
do
    printf '%s%s\n' "$padding" "$line"
done <"$tmpfile"

Тестирование:

$ fortune | cowsay | ./center
            ________________________________________
           / "There are two ways of constructing a  \
           | software design: One way is to make it |
           | so simple that there are obviously no  |
           | deficiencies, and the other way is to  |
           | make it so complicated that there are  |
           | no obvious deficiencies."              |
           |                                        |
           \ -- C. A. R. Hoare                      /
            ----------------------------------------
                   \   ^__^
                    \  (oo)\_______
                       (__)\       )\/\
                           ||----w |
                           ||     ||

$ fortune | cowsay -f bunny -W 15 | ./center -c 100
                                  _______________
                                 / It has just   \
                                 | been          |
                                 | discovered    |
                                 | that research |
                                 | causes cancer |
                                 \ in rats.      /
                                  ---------------
                                   \
                                    \   \
                                         \ /\
                                         ( )
                                       .( o ).