{"id":43,"date":"2009-01-10T08:10:44","date_gmt":"2009-01-10T08:10:44","guid":{"rendered":"http:\/\/kedar.nitty-witty.com\/?p=43"},"modified":"2015-03-12T06:02:05","modified_gmt":"2015-03-12T06:02:05","slug":"linux-shell-commands-quick-how-to","status":"publish","type":"post","link":"https:\/\/kedar.nitty-witty.com\/blog\/linux-shell-commands-quick-how-to","title":{"rendered":"Linux Shell Commands – quick how-tos"},"content":{"rendered":"

Following are linux commands, tricks for doing regular tasks.<\/p>\n

Rename files: replace space by _ in linux:<\/h1>\n
\n
\r\nfor files in *; do mv \"$files\" `echo $files | tr ' ' '_'`; done\r\n<\/pre>\n<\/blockquote>\n
Change case of multiple file names:<\/h1>\n
\n
for files in *; do mv $files `echo $files | tr '[:upper:]' '[:lower:]'`; done<\/pre>\n<\/blockquote>\n
Find files having large size:<\/h1>\n
\n
ls -hlRtr | awk '{print $5 \" \" $6 \"-\" $7 \" \"$9}' | grep '[0-9]G ' <\/pre>\n<\/blockquote>\n
– Variants: grep ‘[0-9][0-9][0-9]M’  will give you files having sizes xxxMBs.<\/p>\n
Find and replace text from multiple files :<\/h1>\n
\n
find .\/ -type f | xargs perl -pi -w -e 's\/SEARCH-TERM\/REPLACE-TERM\/g;'<\/pre>\n<\/blockquote>\n
Find text in file:<\/h1>\n
\n
find . -name \"*.php\" | xargs grep \" order by l.ID \"<\/pre>\n<\/blockquote>\n
\n
find . -name \"*.pl\" | xargs grep \"virtualTourUrl\"<\/pre>\n<\/blockquote>\n
\n
grep *.* \"Pattern\"<\/pre>\n<\/blockquote>\n
Find and Delete file within last one hour:<\/h1>\n
\n
find \/some\/dir -type f -mmin +60 | xargs rm -f<\/pre>\n<\/blockquote>\n
\n
find . -cmin +60 -exec rm -f {} \\;<\/pre>\n<\/blockquote>\n
Find files last modified \/ accessed – copy to other directory:<\/h1>\n
\n
find . -mtime +1 -exec cp {} TARGET_FOLDER \\;<\/pre>\n<\/blockquote>\n
– atime..last access
\n– mtime..last modify
\n– ctime..last status change<\/p>\n
Replace content of a file:<\/h1>\n
\n
perl -pi -e \"s\/kedar\/radek\/g\" a.txt<\/pre>\n<\/blockquote>\n
\n
perl -pi -e \"s\/OLDTEXT=OLDVALUE\/NewText=NewValue\/g\" *.*\r\n<\/pre>\n<\/blockquote>\n
Find a.txt and Replace content by string comparison and save in to other file:<\/h1>\n
\n
find .\/ -name \"a.txt\" -exec sed 's\/radek\/kedar\/g' {} \\; > b.txt\r\n<\/pre>\n<\/blockquote>\n
Find files modified in last n days:<\/h1>\n
\n
find *.sql -mtime +n -exec ls -l --sort=time {} \\;\r\n<\/pre>\n<\/blockquote>\n
Create and Extract a Tar file:<\/h1>\n
\n
tar -cvf \/path\/to\/file.tar \/path\/to\/source\/ archived<\/pre>\n<\/blockquote>\n
\n
tar -xvf \/path\/to\/file.tar\r\n<\/pre>\n<\/blockquote>\n
A quick sftp \u2013 secure file transfer program to transfer files between linux\/unix machines:<\/h1>\n
\n
sftp usename@hostname\/ipaddress\r\npassword: ****\r\nsftp> ls #executed on remote machine\r\nsftp> lls #executed on local machine\r\nsftp> get *.* #download all files from remote machine to local machine\r\nsftp> put *.* #upload files to remote machine\r\n\r\n- Create directory in sftp: mkdir [For local: lmkdir]\r\n- Change directory in sftp: cd [For local: lcd]\r\n- get \/ mget : download files to local linux machine\r\n- put \/ mput : upload files to remote linux machie\r\n<\/pre>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"Following are linux commands, tricks for doing regular tasks. Rename files: replace space by _ in linux: for files in *; do mv “$files” `echo $files | tr ‘ ‘…\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[6],"tags":[25,59,172,426],"class_list":["post-43","post","type-post","status-publish","format-standard","category-technical","tag-command","tag-linux","tag-linux-commands","tag-technical"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t