laggardkernel

There's not a complete hook system designed in Bash when compared with other modern shells. PROMPT_COMMAND variable is used as a hook in Bash, which is equivalent to precmd hook in ZSH, fish_prompt in Fish. For the time being, ZSH is the only shell I've known that has a chpwd hook builtin.

PROMPT_COMMAND

If set, the value is interpreted as a command to execute before the printing of each primary prompt ($PS1).

https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html#Bash-Variables

chpwd Hook in Bash

tomsing1

# Shell function to subsample to a fixed number of alignments,
# requiring the sambamba and samtools suites to be available.
# see https://www.biostars.org/p/76791/
function SubSample {
  local FACTOR=$(samtools idxstats $1 | cut -f3 | \
    awk -v COUNT=$2 'BEGIN {total=0} {total += $1} END {print COUNT/total}')

  if [[ $FACTOR > 1 ]]
    then
    echo '[ERROR]: Requested number of reads exceeds total read count in' $1 '-- exiting' && exit 1

mfansler

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hpages

BLAS benchmarks

WORK IN PROGRESS!

1. The operations that we benchmarked

We benchmarked the following operations (all operations got timed with system.time()):