# Output 1 2 3...99
for i in {1..99}
do
echo $i
done
for ((i=1;i<=99;i++))
do
echo $i
done
for i in `seq 1 99`
do
echo $i
done
# Output 1 3 5...99
for i in `seq 1 2 99`
do
echo $i
done
# Output a to z
for i in {a..z}
do
echo $i
done
Pure-FTPd 在 configure 時加 --with-uploadscript 參數可以 enable uploadscript 的功能,
就是上傳檔案後可以呼叫外部程式或 script.
pure-ftpd 啟動參數加 -o, 有設定檔(pure-ftpd.conf)的系統就設 CallUploadScript yes
必需先啟動 pure-ftpd 後再啟動 pure-uploadscript, 不然無法運作.
pure-uploadscript -Br /usr/local/bin/uploadscript.sh
上傳檔案的絕對路徑會帶到第一個參數 $1
其他可用的環境變數如下:
$UPLOAD_SIZE : the size of the file, in bytes.
$UPLOAD_PERMS : the permissions, as an octal value.
$UPLOAD_UID : the uid of the owner.
$UPLOAD_GID : the group the file belongs to.
$UPLOAD_USER : the name of the owner.
$UPLOAD_GROUP : the group name the file belongs to.
$UPLOAD_VUSER : the full user name, or the virtual user name. (127 chars max)
uploadscript 範例, 上傳的檔會移到 /tmp/日期 目錄下, 並記錄一筆 Log 到 /var/log/uploadscript.log
#!/bin/sh
DIR=/tmp/`date +%Y%m%d`
[ -d $DIR ] || mkdir $DIR
mv "$1" $DIR
echo `date` size $UPLOAD_SIZE by $UPLOAD_USER >> /var/log/uploadscript.log
Pure-FTPd 1.0.29 released on 2010-03-15, 最近改版還滿勤的.
另一套 ProFTPD 在 1.3.3 版(2010-02-24 Released)也加入了 mod_exec,
比起 Pure-FTPd uploadscript 更為強大, 各種 FTP 的 event 都能呼叫外部程式或 script.
要用 SSH public key authentication 通常會這樣做
ssh-keygen
scp ~/.ssh/id_rsa.pub remote-host
ssh remote-machine
cat id_rsa.pub >> ~/.ssh/authorized_keys
2-4 步驟可以用一行指令取代
ssh-copy-id -i ~/.ssh/id_rsa.pub remote-host
ref. 10 個最酷的 Linux 單行命令
Top Ten One-Liners from CommandLineFu Explained
CommandLineFu All commands sorted by votes
SADDR=台中市中區中山路1號
DADDR=台中市西屯區文華路100號
w3m -dump "http://maps.google.com.tw/maps?saddr=$SADDR&daddr=$DADDR" | egrep "公里.*大約"
輸出結果:
8.3 公里 - 大約 24 分鐘
chkconfig --list | awk '/0:/{system("chkconfig "$1" off")}'
Linux 安裝好預設會開一些 Service, 若用不到就先全關, 再開自己要的.
chkconfig crond on
chkconfig network on
chkconfig syslog on
chkconfig sshd on
Shell variable must within single-quotes in awk command, just like '$A'
e.g. File fruit.txt content as follow
apple 99
orange 25
lemon 30
FRUIT=apple, To get number after $FRUIT
awk '/'$FRUIT'/ {print $2}' fruit.txt (Rignt)
awk '/$FRUIT/ {print $2}' fruit.txt (Wrong, not work)
