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→Remove empty lines
Example:
Example:
<nowiki>echo "esto es un ejemplo" | sed 's#e#R#g'</nowiki>
<nowiki>echo "esto es un ejemplo" | sed 's#e#R#g'</nowiki>
==Replace New Line Characters==
sed ':a;N;$!ba;s/\n/ /g'
This will read the whole file in a loop, then replaces the newline(s) with a space.<br />
Explanation:<br />
Create a label via :a.<br />
Append the current and next line to the pattern space via N.<br />
If we are before the last line, branch to the created label $!ba ($! means not to do it on the last line as there should be one final newline).<br />
Finally the substitution replaces every newline with a space on the pattern space (which is the whole file).<br />
Here is cross-platform compatible syntax which works with BSD sed (as per @Benjie comment):<br />
sed -e ':a' -e 'N' -e '$!ba' -e 's/\n/ /g'
==Replace New Line (\n) with ", "==
sed -e ':a' -e 'N' -e '$!ba' -e 's/\n/", "/g'
tr -d '\n'
==Uppercase to lowercase==
sed 's/.*/\L\1/g' < input
==Mongo operators to Python List==
cat mongodb_operators.txt | grep -E ^\\\$ | awk '{ print "\x27" $1 "\x27" }' | sed s/\\\$//g | sed ':a;N;$!ba;s/\n/, /g'
==Print some line of a file==
To print line 45 from file rigodon-22011715-3.jl.ok
sed -n 45p rigodon-22011715-3.jl.ok
To print multiple lines:
sed -n -e 5p -e 8p file
To print a range of lines:
sed -n 5,8p file
To print a range and some specific file:
sed -n -e 5,8p -e 10p file
==Remove empty lines==
<syntaxhighlight lang="bash">
sed -i '/^$/d' file.txt
</syntaxhighlight>
== Remove white spaces ==
<syntaxhighlight lang="bash">
sed -e 's/^[ \t]*//'
</syntaxhighlight>