MIT-Curricular/OS/bash/Week2/answers.md

## OS Lab - Week2

Q2. (* finds all the files in the folder with exactly two characters)
```bash
	grep -E '^..$' * 
	grep '^[A-Z]' *
	grep '\.$' *
	grep ' ' *
	grep '[0-9]' filename > outputfile
```


Q3.
```
	grep -c "ICT" ITStudents.txt
	sed 's/:IT:/:Information Technology:/g' students.txt > ITStudents.txt
	sed awk -F: '$1 == "1234" { avg = ($6 + $7 + $8) / 3; print avg }' students.txt
	awk 'NR==1 { print toupper($0) } NR>1 { print }' students.txt
```


Q4.	
```bash
	grep -rl "MIT" . | xargs sed -i 's/MIT/Manipal Institute of Technology/g'
```

Q5.	

```bash
	find . -type f -name '*[0-9]*' -exec wc {} +
```


Q6. 
```bash
	for i in {1..5}; do wc example.txt & done
```

```bash
	pkill wc
```