====== BASH - Files - Delete empty lines ======

===== Using awk =====

<code bash>
awk 'NF' my_input > my_output
</code>

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===== Using sed =====

Delete empty lines using sed.

<code bash>
sed '/^$/d' <input-file>
echo "LINE" | sed '/^$/d'
echo "$VAR" | sed '/^$/d'
sed '/^[[:space:]]*$/d' input_file

sed '/^$/d' input > output
sed '/^\s*$/d' in > out
sed -n '/^\s*$/!p' in.txt > out.txt
sed '/^[[:space:]]*$/d' input > output
</code>

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===== Examples =====


==== Delete all empty lines from a file ====

<code bash>
sed '/^$/d' /tmp/data.txt
</code>

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==== Store output to another file use redirection operator ====

<code bash>
sed '/^$/d' /tmp/data.txt > /tmp/output.txt
</code>

----

==== Update the file directly ====

<code bash>
sed -i '/^$/d' /tmp/data.txt 
</code>