Linux command
tr 命令
文本
涉及管道、覆盖或删除，执行前请先确认路径和参数。
常用示例
Translate characters
echo "hello" | tr 'a-z' 'A-Z'
Delete specific characters
echo "hello 123" | tr -d '0-9'
Squeeze repeated characters
echo "helllo" | tr -s 'l'
Replace newlines with spaces
tr '\n' ' ' < [file]
Delete non-printable characters
tr -cd '[:print:]' < [file]
Translate spaces to tabs
tr ' ' '\t' < [file]
Delete all except specified characters
echo "hello123" | tr -cd '0-9'
说明
tr translates, deletes, or squeezes characters from standard input, writing to standard output. It operates character-by-character, making it efficient for simple transformations. Translation replaces each character in set1 with the corresponding character in set2. If set2 is shorter, its last character is repeated. If longer, excess characters are ignored. With -d, characters in set1 are deleted. With -s, repeated characters in set1 are squeezed to single occurrences. Both can be combined. -c complements set1, meaning "all characters NOT in set1." Useful for keeping only specific characters.
参数
- -d, --delete
- Delete characters in set1
- -s, --squeeze-repeats
- Replace repeated characters with single occurrence
- -c, -C, --complement
- Use complement of set1
- -t, --truncate-set1
- Truncate set1 to length of set2
FAQ
What is the tr command used for?
tr translates, deletes, or squeezes characters from standard input, writing to standard output. It operates character-by-character, making it efficient for simple transformations. Translation replaces each character in set1 with the corresponding character in set2. If set2 is shorter, its last character is repeated. If longer, excess characters are ignored. With -d, characters in set1 are deleted. With -s, repeated characters in set1 are squeezed to single occurrences. Both can be combined. -c complements set1, meaning "all characters NOT in set1." Useful for keeping only specific characters.
How do I run a basic tr example?
Run `echo "hello" | tr 'a-z' 'A-Z'` in a terminal, then adjust file names, paths, flags, or remote targets for your system.
What does -d, --delete do in tr?
Delete characters in set1