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what's the fastest way to sort file by the first letter of each line? should one use linux sort command or are there other more efficient alternatives? if I am using sort, how do I sort only by the first letter and ignore the rest?
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To sort lines of text files, we use the sort command in the Linux system. The sort command is used to prints the lines of its input or concatenation of all files listed in its argument list in sorted order. The operation of sorting is done based on one or more sort keys extracted from each line of input.
In the Linux system, you will find one command named sort. This command can sort your data alphabetically. Here flag -k is used to select a field for sorting.
If you add the -X option, ls will sort files by name within each extension category. For example, it will list files without extensions first (in alphanumeric order) followed by files with extensions like . 1, . bz2, .
the -r flag is an option of the sort command which sorts the input file in reverse order i.e. descending order by default.
This will sort by the first character
sort -k1.1,1.1 filename
add -s if you want to preserve the input order of lines with the same first character
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