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Does it have to be sed?awk 'NF==1{x=$1}NF==2{$1=x;print}' file

You can do that:

/usr/bin/printf "[%s] %s\n" "$(/usr/bin/date +"<format>")" "$(/usr/bin/df -h /backup | /usr/bin/tail -1)"

See "man date" for suitable format options. Once the output suits you...

Very true! The shell maintains literally a switch, which flips between "inside quotes" and "outside quotes". Once it encounters a quotation mark, the switch flips into the other position. Per default...

The short answer is, you cannot put quotes in quotes that way directly, the shell won't do that kind of doublethink. You asked for literal quotes, so it gave you literal quotes; making them go away...

Apologies, this site seem focused on smallest number of chars, not clarity.

if(skip != 0 || $2+0 == day + 2) skip=1

# or
if (skip == 0) {
if ($2+0 == day + 2) skip =1
}

if(skip...