bash notes

Bash.sh

# Renaming all files
ls -v sprites*.jpg | cat -n | while read n f; do mv -n "$f" "pc-$(($n-1)).jpg"; done
 
 # ls -v : Natural sort
 # cat -n : Appending line number before each line (Starts from 1)
 # mv -n : Do not overwrite
 # $(($n - 1)) : String to Int then arithmetics
 
 
# Appending file extension to all files
ls | xargs -I % mv % "%.mp4" 
 
 
# Concatenates files with expression
ls prefix*.ts | xargs cat > concat.ts
 
# Check which files are not found in the series
# spaces between [[ ]] are important
for file in {1..500}.m4s; do if [[ ! -f "$file" ]]; then echo "$file not found"; fi; done

# Concatenates files with for-loop precised range
for file in v1_1-{1..198}.m4s; do echo $file; done | xargs cat > 1-198.m4s

# Single line command to concat both header and MDAT
cat v1_1-init.mp4 <(for file in v1_1-{61..198}.m4s; do echo $file; done | xargs cat) > segment.mp4