Echo (Bash): verschil tussen versies
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| (2 tussenliggende versies door dezelfde gebruiker niet weergegeven) | |||
| Regel 30: | Regel 30: | ||
</pre> | </pre> | ||
| − | == Strip output | + | == Strip whitespace around output == |
| − | There are some nifty tricks to make the output of commands less messy. Some examples: | + | There are some nifty tricks to make the output of commands less messy. They seem to involve <code>echo</code> and when I was looking for this around 2023.08, I looked here first. Some examples: |
<pre> | <pre> | ||
| Regel 51: | Regel 51: | ||
your_command | grep -o '.' | your_command | grep -o '.' | ||
</pre> | </pre> | ||
| − | |||
| − | |||
== Zie ook == | == Zie ook == | ||
| + | * [[Grep]] | ||
| + | * [[Pipelining & redirection (Bash)]] | ||
* [[printf]] | * [[printf]] | ||
Huidige versie van 24 aug 2023 om 18:35
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 '.'