sed
sed is a Linux command in the Text Processing category, rated beginner difficulty. Stream editor for filtering and transforming text. The syntax is sed [options] script [file]. Key options and parameters: script, file — sed command, input file. It returns transformed text. A close relative is grep, which searches for patterns in files using regular expressions. A close relative is awk, which powerful text processing language. Ideal for column-based data and reports. A close relative is sort, which sorts lines of text files alphabetically or numerically. More about this category: Linux text processing commands — grep, sed, awk, sort, cut, tr, and more. Search, filter, transform, and format text content. Related Text Processing commands: grep, awk, sort, uniq, wc, cut, tr, tee. This page is part of the free Linux Reference documentation covering 304+ commands, each with syntax, options, practical examples, and a difficulty rating.