linux shell 常用命令（Linux shell 常用命令）.docVIP

linux shell 常用命令（Linux shell 常用命令） Return to last directory - $CD Find files in a directory that contain a character (two methods) $find ftp/ -name *140* -exec RM -f {} \; $find ftp/ -name *141* xargs RM | Restrict the find command to find only in the current directory and not to the subdirectories. $find. -maxdepth 1, -type, f $find. -name. . -type, D, -prune, -o, -type, F, -name, *.sh, -print A file that searches for a directory and subdirectories containing a string $grep -lr hello A file that contains a string in a directory that does not contain subdirectories $find! -name . -type D -prune -o -type f -print xargs grep -lr hello | File file, for each domain in the |; If a domain is empty, it is replaced by the variable $aa, and the rest of the domain remains unchanged. Note: the file has N rows, and N is large. Awk -F|OFS= {for | (i=1; i=NF; i++) {if ($i==) $i= $aa}print $0}File tmpfile Sed removes spaces from text $cat file Hello world World Hello $sed, -e,s/, //g, file HelloWorld Worldhello Sed deletes blank lines $cat tmp.txt | sed/^$/d t Replace string File sed -es/-Jul-/-May-/g| $cat In Linux, the last line in the file is deleted directly through the command Sed -i$dfile Delete duplicate rows in a file (duplicate rows together) Awk{if ($0 = = line) print; line=$0}file Deleting duplicate rows from a file (duplicate rows may not be together) Sort tmp.txt | uniq t.txt We find two files Cat file1 File2 sort uniq | | Find the intersection of two files Cat file1 File2 sort uniq -d | | Complement for two files Cat file1 File2 sort uniq -u | | TR is used primarily for character conversion or for extracting control characters Remove repeated letters or compress them together $tr -s, [a-z] test.txt Cat test.txt tr -s | $[a-z] Remove blank lines (line octal representation for \012) -- delete duplicate line $tr -s, [\012] test.txt Cat test.txt tr -s | $[\n] Upper case to lower case $cat test.txt | tr [a-z] [A-Z] $cat test.txt tr | : [[lower:]: upper:] Delete spec