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Quick TrainerUseful Bash One-Liners
Learn what common Bash commands and one-liners actually do, in both directions.
Code32 items3 levelsDifficulty 3/5
Free · no signup · works on any device
Levels
Start easy — harder levels unlock as you improve, or jump ahead anytime.
1
Basics
8 items
2
Files & Text
11 items
3
Pipelines & Power Tools
13 items
All 32 cards
pwd
print working directory
ls -la
list all files in long format
cd -
go to previous directory
whoami
print current username
clear
clear the terminal screen
history
show command history
man ls
show manual page for a command
echo $PATH
print the PATH variable
cat file.txt
print file contents
grep "pattern" file
search for a pattern in a file
wc -l file
count lines in a file
head -n 10 file
show first 10 lines of a file
tail -f file
follow a file as it grows
chmod +x script.sh
make a script executable
find . -name "*.txt"
find files by name
cp -r dir1 dir2
copy a directory recursively
mv old new
rename or move a file
rm -rf dir
force delete a directory
ln -s target link
create a symbolic link
du -sh *
show size of each item in a folder
df -h
show disk space usage
ps aux | grep node
find a running process
kill -9 PID
force kill a process
sort file | uniq -c
count occurrences of unique lines
awk '{print $1}'
print the first column
sed 's/old/new/g' file
replace all matches of text
curl -O https://example.com/file
download a file
tar -czf archive.tar.gz dir
create a gzip-compressed archive
export PATH=$PATH:/new/dir
add a directory to PATH
chmod 755 file
set read/write/execute permissions
xargs rm < list.txt
run a command on each input line
ls | wc -l
count files in a directory
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