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## OS Lab - Week2
Q2.
- `grep -E '^..$' *` (finds all the files in the folder with exactly two characters)
- `grep '^[A-Z]' *`
- `grep '\.$' *`
- `grep ' ' *`
- `grep '[0-9]' filename > outputfile`
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`
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. - `grep -rl "MIT" . | xargs sed -i 's/MIT/Manipal Institute of Technology/g'`
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 {} +
```
Q5. - `find . -type f -name '*[0-9]*' -exec wc {} +`
Q6.
```bash
for i in {1..5}; do wc example.txt & done
```
Q6. - `for i in {1..5}; do wc example.txt & done`
- `pkill wc`
```bash
pkill wc
```