Tech Support Notes

Sed / Awk

Sed

Display in reverse order

sed -n '1!G;h;$p' filename.txt

sed '/./=' filename.txt | sed 'N; s/\n/ /'

[walternate] (~) >>> sed '/./=' testsed | sed 'N; s/\n/ /'
1 extension=mysql.so
2 extension=mysqli.so
3 extension=pdo_mysql.so

Awk

Grab only the relevant lines from a file with awk

awk 'NR==200,NR==230' /path/to/file