Echo (Bash)

Newline

Er is geen eenduidige manier om met echo een newline te generen. Oa. daarom is printf waarschijnlijk beter dan echo [1]

Variabelen

Bv.:

#!/bin/bash
#
a="hoi"
echo $a
echo "$a"
echo $a"hallo-1"
echo "$a""hallo-2"
echo "$ahallo-3	"
echo "tekst1""$a""tekst2"

Output:

hoi
hoi
hoihallo-1
hoihallo-2
-3
tekst1hoitekst2

Strip whitespace around output

There are some nifty tricks to make the output of commands less messy. They seem to involve echo and when I was looking for this around 2023.08, I looked here first. Some examples:

echo "Name (2): $(wp --user=4 wc product_attribute_term get $taxid $i --field=name --format=csv | grep .)"

The part |grep . actually strips the messy things.

More: Pipelining & redirection (Bash)#Trim whitespace around output

Some alternatives (didn't try them out):

echo -n "$(your_command)"

echo -n "$(your_command)" | tr -d '[:space:]'

your_command | grep -o '.'

Zie ook

• Grep
• Pipelining & redirection (Bash)
• printf

Bronnen

• https://unix.stackexchange.com/questions/219268/how-to-add-new-lines-when-using-echo/219274#219274
• https://unix.stackexchange.com/questions/65803/why-is-printf-better-than-echo/65819#65819