Sorting

Sort a text file

sort sampleIDs.txt > sampleIDs_sorted.txt

get unique list of  sorted text elements

sort -u sampleIDs.txt > sampleIDs_unique_sorted.txt

Word frequency table

Identify duplicated ID entries.  Get for each column element (word/string ID)  the frequency of it's occurrence (sorted)

# Count the number of repeats for each ID (present in first or single column) 

cut -f 1 sampleIDs.txt | sort |  uniq -c | sort -rnk 1

Sorted list of files

Sorting list of files

ls *.txt | sort