Commands which is basically called on terminal.
1分後に処理を実行
echo 'foo.sh -t bar -e' | at now + 1minute
Install.
sudo apt get install autossh
Launch on /etc/rc.local
sudo -u pi autossh -f -N -R 10022:localhost:22 -p 123 user@example.net
certbot delete --cert-name example.net
毎日0時10分に処理を実行
PATH=/usr/local/bin:/bin:/usr/bin
10 0 * * * foo.sh 2>&1 | logger -p cron.info -t "foo"
レスポンスをファイルに保存します。
curl -O http://sample.com/foo.tgz
プログレスバーを抑制(-s)、ただしエラーは出力します(-S)。
curl -s -S http://sample.com/api?foo=bar
dd if=/dev/zero of=/tmp/testimg bs=1024 count=1024
Find invalid symbolic links.
find /opt/kanesue -xtype l
See http://qiita.com/kawaz/items/ba0e75b6828bd3951e52
git diff
git diff HEAD
git diff --staged
git diff -w # Ignore white spaces.
To remove merged branches.
git branch --merged | egrep -v "(^\*|master|main|develop)" | xargs git branch -d
How to rename master to main.
git branch -m master main
git push -u origin main
For github: Settings -> Branches -> Rename default branch For bitbuchet: Repository Settings -> Repository Details -> Advanced -> Main branch
See also How to Rename the master branch to main in Git.
How to change default editor to nano.
git config --global core.editor "nano"
# 一覧
git branch -r
# 作成
git push -u origin branch_name
# 作業開始
git checkout --track origin/branch_name
# 削除
git branch -r -d origin/branch_name
git push origin :branch_name
CSVの差分を見る
git diff --color-words="[^[:space:],]+" x.csv y.csv
特定の拡張子だけ対象にする
rsync -avz --include "*/" --include "*.csv" --exclude "*" foo/ host:foo/
ファイルのチェックサムだけを比較する（タイムスタンプを見ない）
rsync -crlpgoDv foo/ bar/
特定のディレクトリ(pub,sys)だけ転送する(bash)
rsync -avz ./{pub,sys} host:foo/
特定のディレクトリ(log,tmp)を除外して転送する
rsync -crlpgoDvn --exclude 'log' --exclude 'tmp' foo/ bar/
Remove lines which contain specific string from multiple files.
find . -name "*.html" | xargs sed -i '/foobar/d'
Replace text in the file.
sed -i 's/foo/bar/' sample.txt
Shutdown on the time.
sudo shutdown -r 23:00
Create swap memory on the host.
dd if=/dev/zero of=/mnt/1gb.swap count=1024 bs=1024K
mkswap /mnt/1gb.swap
chmod 600 /mnt/1gb.swap
swapon /mnt/1gb.swap
If you'd like to make different size, just adjust count parameter. i.e. count=4096 for 4G swap.
If it's needed to be permanent, add the following to /etc/fstab.
/mnt/1gb.swap none swap sw 0 0
How to verify /etc/fstab without rebooting.
sudo findmnt --verify --verbose
https://serverfault.com/questions/174181/how-do-you-validate-fstab-without-rebooting
Play sound.
aplay foo.wav
For mp3 format, ffplay is available.
ffplay -v 0 -nodisp -autoexit foo.mp3
the tool to benchmark web server responses. The example tries to acess 100 times with 10 concurrency.
ab -n 100 -c 10 https://lumber-mill.co.jp
Lists the processes which use the TCP port.
lsof -i:80
Lists only the process numbers.
pgrep apache2
https://serverfault.com/questions/877783/apache-wont-stop-when-using-service-apache2-stop