Difference between revisions of "Tr"
From MohidWiki
m (1 revision) |
|||
| (2 intermediate revisions by the same user not shown) | |||
| Line 4: | Line 4: | ||
>for i in `find | grep Nomfich`; do j=`echo $i | tr [Nom] [nom]`; if [ $i != $j ]; then mv $i $j; fi; done; | >for i in `find | grep Nomfich`; do j=`echo $i | tr [Nom] [nom]`; if [ $i != $j ]; then mv $i $j; fi; done; | ||
This bash line transforms the ''Nomfich_*.dat'' files into ''nomfich_*.dat'' | This bash line transforms the ''Nomfich_*.dat'' files into ''nomfich_*.dat'' | ||
| + | |||
| + | > cat somefile.txt | tr -cd [:graph:] | ||
| + | The above command deletes all non-printable characters (good for chomping a string...) | ||
| + | |||
| + | > tr -d "\r\n" file1 | ||
| + | The above command joins all lines from text input. | ||
| + | |||
| + | > tr -dc [:print:] | ||
| + | The above command removes all non-printable characters (printable characters include white spaces). | ||
| + | This means that it will effectively concatenate all lines coming from a text input. | ||
| + | |||
| + | ==Related links== | ||
| + | *[[sed]] | ||
| + | *[[awk]] | ||
| + | *[[regexp]] | ||
| + | |||
[[Category:Technology]] | [[Category:Technology]] | ||
[[Category:Linux]] | [[Category:Linux]] | ||
| − | |||
| − | |||
| − | |||
Latest revision as of 15:16, 27 April 2010
Tr is a little linux utility which translates standard input and returns in standard output. It is useful for easily converting from uppercase to lowercase, etc...
Examples
>for i in `find | grep Nomfich`; do j=`echo $i | tr [Nom] [nom]`; if [ $i != $j ]; then mv $i $j; fi; done;
This bash line transforms the Nomfich_*.dat files into nomfich_*.dat
> cat somefile.txt | tr -cd [:graph:]
The above command deletes all non-printable characters (good for chomping a string...)
> tr -d "\r\n" file1
The above command joins all lines from text input.
> tr -dc [:print:]
The above command removes all non-printable characters (printable characters include white spaces). This means that it will effectively concatenate all lines coming from a text input.
