chazer

Copy volume

docker run --rm \
  -v "$VOLUME_FROM":/from:ro \
  -v "$VOLUME_TO":/to \
  -u root alpine \
  sh -c 'rm -rf /to 2>/dev/null; cd /from; cp -av . /to'

chazer

Linux cheatsheet

Fill file with zeros

bash -c 'read blocks blocksize < <(stat -c "%b %B" "$1"); dd if=/dev/zero bs=${blocksize} count=${blocks} of="$1" conv=notrunc status=progress' - /FILE

Create swap file

chazer

SSH cheats

Copy folder to remote server

REMOTE=server.fqdn
sudo tar -cz -C `pwd` . \
    | ssh "$REMOTE" "sudo mkdir -p $(pwd) && sudo tar --same-owner --same-permissions -xzv -C $(pwd)"

Allow sudo without password on remote server

chazer

Example, how to remove argument from http request.

Replace requests like:

DELETE /v1/path/FILE?multipart-manifest=delete HTTP/1.1"

with:

DELETE /v1/path/FILE?

chazer

The .gitignore file cheat sheet

Gitignore rules

Wildcard match

Rule	RegExp	Description
*	^[^/]+/?$	one file/dir name
**	^.*/?$	multiple file/dir names

chazer

Docker project for antminer-monitor

chazer

#!/bin/sh

sed_escape() { sed -e 's/[]\/$*.^|[]/\\&/g'; };

replace_env() {
    local FILE=$1; shift
    local ENV=$1; shift
    local VAL=$1
    [ -f "$FILE" ] || (
        echo "File not found $FILE" >&2