fasta_clipping_histogram.pl: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/fasta_clipping_histogram.pl - from package: fastx-toolkit

You may install the required package with command apt-get install {package}
Error in other languages:
fasta_clipping_histogram.pl: bevel nie gevind nie
fasta_clipping_histogram.pl: comandă negăsită
fasta_clipping_histogram.pl: comando não encontrado
fasta_clipping_histogram.pl: commande introuvable
fasta_clipping_histogram.pl: command not found
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fasta_clipping_histogram.pl: komanda nerasta
fasta_clipping_histogram.pl: Kommando nicht gefunden.
fasta_clipping_histogram.pl: kommandot finns inte
fasta_clipping_histogram.pl: komut yok
fasta_clipping_histogram.pl: nie znaleziono polecenia
fasta_clipping_histogram.pl: níor aimsíodh an t-ordú
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fasta_clipping_histogram.pl: opdracht niet gevonden
fasta_clipping_histogram.pl: parancs nem található
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fasta_clipping_histogram.pl: príkaz nenájdený
fasta_clipping_histogram.pl: příkaz nenalezen
fasta_clipping_histogram.pl: команда не найдена
fasta_clipping_histogram.pl: командата не е открита
fasta_clipping_histogram.pl: 命令找不到
fasta_clipping_histogram.pl: コマンドが見つかりません