benwei

/\%xnn characters (nn range is 00-FF)

%s/\%xnn//g -- replace all \xnn characters (nn range is 00-FF)

%s/\%unnnn//g -- replace all unicode code 'nnnn' characters, (nn range is 0000-FFFF)

benwei

#!/bin/sh
## refernce http://www.dict.org/rfc2229.txt
word="$1"
if [ -z "$word" ]; then
	echo "syntax: ./dict <word>"
	exit 1
fi

curl "dict://dict.org/d:$word"

benwei

t="${0%%`basename $0`}"; cd "$t" ; ABS_PATH=`pwd`
echo $ABS_PATH

benwei

openssl s_client -connect $your_ssl_website -tlsextdebug 2>&1  | grep 'server extension'

benwei

#!/bin/bash
# author: terry, ben
# tested GNU bash, version 3.2.57(1)-release (x86_64-apple-darwin14)
# FYR (for Mac OS, may need some change for linux)
# second -> ISO8601
date -u -r 1453951368 +%FT%TZ
## ouptput: 2016-01-28T03:22:48Z
# ISO8601 -> second
date -ju -f "%FT%TZ" 2016-01-28T03:22:48Z +%s
## output: 1453951368

benwei

How to check threads status within a process in embedded linux system?
Author: Ben Wei 2017-11-28
system linux kernel 3.10.73+

# ps aux | grep pulseaudio | grep -v grep
pulse      142  7.5  4.3  44312  4664 ?        S<sl Nov24 406:35 /usr/bin/pulseaudio --daemonize=no

## use top command with -H, you can browse the thread load in the file
# top -H -p 142

benwei

find *.txt | grep " " | while read fn ; do xfn=`echo $fn | tr -d ' '`; mv "$fn" "$xfn" ; done

benwei

#!/bin/sh
target="$1"
if [ -z "$target" ]; then
    echo "syntax: <folder-name>"
    exit 1
fi
find $target -type f -exec md5sum {} + | cut -d" " -f1 | sort | md5sum | cut -d" " -f1
exit $?

benwei

# jq tool: https://github.com/stedolan/jq
$ echo '[{"a":"2"}]' | jq '.[]'
{
  "a": "2"
}
$ echo '[{"a":"2"}]' | jq '.[] | .["a"]'
"2"
# view with online tool jqplay
## https://jqplay.org/s/OrtlyrkIyg

benwei

 ls *.py | while read fn ; do line_num=`cat "$fn" | wc -l`; echo "\"$fn\",$line_num" ; done