Basic Unix commands

memo.sh

# File basics:
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# list files, sorted by update date (recent last)
ls -rclt
# list files, sorted by update date (recent first)
ls -clt

# (recursive) folder sizes
du -h -d1 # human-readable sizes + dir depth of 1

# List the 20 biggest folders, in current directory
du -k | sort -nr | head -20

# file usage per mount point
df -h # human-readable sizes

# delete folder (recursively)
rm -Rf folder

# Search file content using multiple OR conditions
grep "ERROR\|WARN\|FATAL" *.log

# Search file content and display 3 lines for matches (output context):
grep -C 3 -R profile **/pom.xml

# Highlight the word  'foo' in a stream:
grep --color -E 'foo|$' 
# or:
egrep --color 'foo|$'

# Search file named "filename":
find directory -name "filename"

# File archive manipulation:
############################

# list files in tar.gz archive file:
tar -tvf source.tar.gz

# extract tar archive:
tar -xf source.tar.gz -C output_dir

# create tar archive
tar -cf archive.tar file1 folder2

# unzip file:
unzip -C source.zip -d /output_dir

# shutdown/restart:
############################

# shutdown:
shutdown now

# restart:
shutdown -r now

# Misc
#################################

# Repeat a command every 10 seconds
watch "echo 'foo'" -n 10

# Brace expansion
ls src{Main,Test}.scala