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https://github.com/lifeparticle/Terminal-Commands-Cheatsheet
Terminal-Commands-Cheatsheet
https://github.com/lifeparticle/Terminal-Commands-Cheatsheet
Last synced: 3 months ago
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Terminal-Commands-Cheatsheet
- Host: GitHub
- URL: https://github.com/lifeparticle/Terminal-Commands-Cheatsheet
- Owner: lifeparticle
- License: mit
- Created: 2022-07-06T05:46:43.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2022-10-19T12:52:55.000Z (about 2 years ago)
- Last Synced: 2024-08-01T10:19:19.605Z (6 months ago)
- Homepage:
- Size: 6.84 KB
- Stars: 6
- Watchers: 3
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
#
```shell
# List all available shells in macOS X
cat /etc/shells
# To see which shell you’re running.
echo $0
echo $BASH_VERSION
echo $ZSH_VERSION
# To change to bash shell.
chsh -s /bin/bash
# To change to zsh shell.
chsh -s /bin/zsh
```
# Variables
## Bash
```shell
hw='Hello, World!'
echo "$hw"
# output of a command
first_line=$(head -1 version.txt)
echo "$first_line"
```
# String
## Bash
```shell
num='01234567'
echo "${num:0:3}"
# 012
```
```shell
hw='hello, world!'
echo "${hw^}"
# Hello, world!
echo "${hw^^}"
# HELLO, WORLD!
hw='Hello, World!'
echo "${hw,}"
# hello, World!
echo "${hw,,}"
# hello, world!
```
```shell
majorVersion=$(echo "1.2.3" | cut -d "." -f 1)
minorVersion=$(echo "1.2.3" | cut -d "." -f 2)
buildNumber=$(echo "1.2.3" | cut -d "." -f 3)
echo "${majorVersion} ${minorVersion} ${buildNumber}"
buildNumber=$(echo "$(($buildNumber + 1))")
echo "${majorVersion} ${minorVersion} ${buildNumber}"
newPackageVersion=$majorVersion.$minorVersion.$buildNumber
```
## Zsh
```shell
hw='hello, world!'
echo "${(U)hw}"
echo "${hw:u}"
hw='Hello, World!'
echo "${(L)hw}"
echo "${hw:l}"
# hello, world!
```
# Read
```shell
read name
echo "Hello, $name"
```
# Last 100 commands
## Zsh
```shell
history -1 -100
```
# Examples
```bash
echo \# 5. Number Generation > Number\ Generation.md
echo \# 6. Fibonacci Series > Fibonacci\ Series.md
echo \# 7. Combinatorics > Combinatorics.md
echo \# 8. Dynamic Programming > Dynamic\ Programming.md
echo \# 9. Greedy > Greedy.md
echo \# 10. Algorithm > Algorithm.md
echo \# 11. Number Theory > Number\ Theory.md
echo \# 12. Numerical Methods > Numerical\ Methods.md
echo \# 13. Basics of Numbers > Basics\ of\ Numbers.md
echo \# 14. Java > Java.md
echo \# 15. Computational Geometry > Computational\ Geometry.md
echo \# 16. Math > Math.md
echo \# 17. Physics > Physics.md
echo \# 18. ASCII Table > ASCII\ Table.md
```
```bash
for i in {15..50}; do
mkdir "$i. "
done
```
```bash
declare -a array=("Number Generation" "Fibonacci Series" "Combinatorics" "Algorithm" "Number Theory" "Numerical Methods" "Basics of Numbers" "Java" "Computational Geometry" "Math" "Physics" "ASCII Table")
for ((i=1; i<${#array[@]}+1; ++i));
do
echo "# $i. ${array[$i]}" > ${array[$i]}.md
done
```
# Resources
1. [17 Terminal Commands Every Programmer Should Know](https://medium.com/towards-data-science/17-terminal-commands-every-programmer-should-know-4fc4f4a5e20e)