Linux

Copy directories without content

rsync -av -f"+ */" -f"- *" "$source" "$target"

Find files

find /path/to/dir -type f -name "*" -newermt 2013-02-07 ! -newermt 2013-02-08
find $HOME/projects -type f -name "*.py" -newermt 2013-02-07 ! -newermt 2013-02-08 -print
find $HOME/projects -type f -name "*.py" -newermt 2013-02-07 ! -newermt 2013-02-08 -ls

Delete Files older Than

find /var/log -name "*.log" -type f -mtime +30 -delete 
find /var/log -type d -mtime +30 -exec rm -rf {} \;

How to print a file, excluding comments and blank lines, using grep

grep -v '^$\|^#\|^\s*\#' filename | grep -v "^[[:space:]]*$" | more
grep -v "^[[:space:]]*$\|^ *#" filename 

bash operations with file with spaces in name

IFS=$(echo -en "\n\b"); for i in $(ls -d */ | cut -f1 -d'/'); do echo $i; done
IFS=$(echo -en "\n\b"); for i in $(ls -d */ | cut -f1 -d'/'); do echo "$i;"| tr -d '\r\n'; find $i -type f | wc -l; done

ssh automation

ssh -i /usr/local/sbin/id_rsa -oStrictHostKeyChecking=no [email protected] 'upsc qnapups'
-i RSA key, -o add to known host automatically

ls with full path

ls -dl $PWD/*

Set date of directories by latest file inside

IFS=$(echo -en "\n\b"); for d in */ ; do T=`ls -alt --time-style="+%Y%m%d0101.10" $d | tail -1 | awk '{print $6}'`; touch -t $T $d; done

Частотный анализ букв в именах файлов

ls | awk '{for (i=1 ; i<=NF ; i++) array[$i]++ } END{ for (char in array) print char,array[char]}' FS="" | sort -k2 -n

Find and replace characters in file name

for file in `IFS=$(echo -en "\n\b"); find . -name "*[+]*" `; do mv -v $file $(echo $file | sed -e 's/+//g'); done

Audiofile operations

Photo file operations

LVM operations

SSL Certificate with SAN

SSL Certificate signed by your own CA

SD card partition recovery

How to recreate a wiped /boot filesystem in Ubuntu