관련 서적 / 강의 / 자료

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df

• “disk free” command
• total disk size, space used, space available, usage percentage, partition the disk is mounted on

$ df -h
Filesystem      Size  Used Avail Use% Mounted on
overlay         825G  149G  676G  19% /
tmpfs            64M     0   64M   0% /dev
tmpfs           189G     0  189G   0% /sys/fs/cgroup
/dev/sda4       825G  149G  676G  19% /etc/hosts
shm              64M     0   64M   0% /dev/shm
tmpfs           189G   40K  189G   1% /workspace/.kube/config
tmpfs           189G   12K  189G   1% /run/secrets/kubernetes.io/serviceaccount
tmpfs           189G     0  189G   0% /proc/acpi
tmpfs           189G     0  189G   0% /proc/scsi
tmpfs           189G     0  189G   0% /sys/firmware

du

• disk usage
• the size of a given directory or subdirectory

# 뎁스 1 디렉토리들의 disk util (-h: human readable)
$ du -h --max-depth=1

$ du -h --max-depth=1 2>/dev/null

find

# 현재 디렉토리에서 모든 디렉토리 찾기
$ find . -type d

# 현재 디렉토리에서 test가 들어가는 디렉토리 찾기
$ find . -name "*test*" -type d

# 현재 디렉토리에서 모든 파일 찾기
$ find . -type f

$ find . -mtime +1

envsubst

# welcome.txt
Hello user $USER in $DESKTOP_SESSION. It's time to say $HELLO!

$ export HELLO="good morning"
$ envsubst < welcome.txt
Hello user joe in Lubuntu. It's time to say good morning!