cd /tmp
time dd if=/dev/zero bs=2048k of=tstfile count=8192 2>&1 | awk '/sec/ {print $1 / $5 / 1048576, "MB/sec" }'
ls -al tstfile
time dd if=tstfile bs=2048k of=/dev/null count=8192 2>&1 | awk '/sec/ {print $1 / $5 / 1048576, "MB/sec" }'Note: If the machine has more than 16GB of free RAM, the read speed may be incorrect due to RAM caching.
| #!/usr/bin/env bash | |
| # Usage: ./image-compare.sh "${URL_A}" "${URL_B}" | |
| # Example: ./image-compare.sh https://placekitten.com/g/200/300 https://placekitten.com/200/300 | |
| TMP_DIR=$(mktemp -d) | |
| IMG_A_URL="$1" | |
| IMG_A_FILENAME=$(echo "${IMG_A_URL}" | sed -E 's|^.*/([^/]+)(\?.*)?$|\1|') | |
| IMG_A_EXT=$(echo "${IMG_A_FILENAME}" | sed -E 's|^.*\.(.+)|\1|') | |
| IMG_B_URL="$2" |
| #!/usr/bin/env bash | |
| # Usage: ./add-overlay-text.sh input.mp4 "For Review" | |
| set -e | |
| SOURCE_FILE=$1 | |
| OUTPUT_FILE="${SOURCE_FILE%.*}_overlay.${SOURCE_FILE##*.}" | |
| OVERLAY_TEXT=$2 |