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To convert bytes to human readable value:

awk ' BEGIN { split("bytes,KB,MB,GB,TB,PB,EB,ZB,YB",SZ,",") } { p=1;for(i=0;$1/p>1024;i++) p*=1024; printf "%4.4f %s\n", $1/p, SZ[i+1]}'

du -s *.pdf |awk '{sum+=$1}END{print sum}'

That glob is expanded by the shell while parsing the command, which happens before the function is called. For your expected result, quote the argument to the function and use an unquoted $1 in both...

You could replace
cut -d ":" -f 2with
sed 's/[^:]*://; s/^ symbolic link to.*/ symbolic link/'In all cases, it removes everything up to the first colon, inclusive. In the case of symbolic link,...

To replace only the first occurrence you should omit the global option:
sed 's/AlphaLexman/ALM/'

instead of:
sed 's/AlphaLexman/ALM/g'

Hi, as you stated yourself in the first post this will not run in a script (COLUMNS will not be available there). You need to source it from a file:
. file
or run it directly in your interactive...

w=$(( $COLUMNS / 2 - 20 ))
cal | while IFS= read -r line
do
printf "%${w}s %s\n" '' "$line"
done