Frequently Used Shell Script

rajeshkumar created the topic: Frequently Used Shell Script
Shell scripts to convert file names to lower case and upper case
To convert to lower case:

#!/bin/sh
for i in *
do
j=`echo $i | tr '[A-Z]' '[a-z]'`
mv $i $j
done

To convert to upper case:

#!/bin/sh
for i in *
do
j=`echo $i | tr '[a-z]' '[A-Z]'`
mv $i $j
done

Searching for a String in Multiple Files

grep -r "modules" .
grep -lr "modules" .
grep -lr "mod.*" .
grep -r "drupal\|joomla\|wordpress" .
grep -lr "mod.*" ./log*

Filesystems using more than 90% capacity

df -hP | awk '{x=$5;sub ("%","",x)}x>90'
df -h | awk '{if(NF==1){x=$0;getline;if(int($4)>90)print x,$0}else if(int($5)>90) print}'
df -kh | awk '/\/export/ && int($5) >= 90'

Filesystems using more than 90% capacity remotly

ssh -q rajesh 'df -hP' | awk '{x=$5;sub ("%","",x)}x> 30'
ssh -q rajesh 'df -h' | awk '{if(NF==1){x=$0;getline;if(int($4)>60)print x,$0}else if(int($5)>60) print}'

Regards,
Rajesh Kumar
Twitt me @ twitter.com/RajeshKumarIn

Rajesh Kumar

I’m Rajesh Kumar, a DevOps, SRE, DevSecOps, Cloud, and Platform Engineering expert passionate about sharing practical knowledge, real-world experiences, and industry best practices. I have worked at Cotocus and regularly write about technology, travel, investing, health, product reviews, and digital marketing through my various platforms.

I publish technical articles at DevOps School, travel stories at Holiday Landmark, stock market insights at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at TrueReviewNow, and SEO and digital marketing strategies at Wizbrand.