LinuxCommands.md

Important Linux Commands

Shell

Find / Find and Delete Files

find . -name "*.php"

find . -type f -name "*.php" -exec rm -f {} \;

# Delete all except file.txt
find ! -name 'file.txt' -type f -exec rm -f {} +

Find files newer than 2014/Jan/01, in /var/www

touch --date "2014-01-01" /tmp/foo
find /var/www -newer /tmp/foo

Search for text inside files

grep -irn "func main" .

Git

git config --global user.name "name" git config --global user.email "[email protected]"

git init .

git add .
git add -A

git commit -m "commit message"

git commit --amend
git commit --amend -m "revise message"

git branch feature132
git checkout feature132

# Create branch and checkout
git checkout -b feature132

Disable IPTables

iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT

Find suspicious process

lsof -i | less
# note the PID
lsof | grep pid

Linux performance analysis in 60,000 Milliseconds

Netflix Blog

uptime - A way to view the load averages. dmesg | tail - Views the last 10 system messages, if any. vmstat 1 - Prints a summary of key server statistics on each line. mpstat -P ALL 1 - Prints CPU time breakdowns per CPU, which can be used to check for an imbalance. pidstat 1 - Prints a rolling summary instead of clearing the screen. iostat -xz 1 - A tool for understanding block devices (disks). free -m - Columns that show buffers and cache. sar -n DEV 1 - A tool to check the network interface. sar -n TCP,ETCP 1 - Shows key TCP metrics. top Run to see if anything looks different from other commands.

Some of the commands require the sysstat package to be installed

Archival + Compression

TAR + GZip Compress

tar -czf ~/backup-archive.tar.gz ~/backup/

Uncompress

tar -xzvf ~/backup-archive.tar.gz

View Contents of Archive

tar -tf ~/backup-archive.tar

zip -sf ~/compressed.zip