我常用的shell命令

我常用的shell命令
tar:
tar jxvf filename.tar.bz2
tar xvf filename.tar

tar cvf filename.tar file

tar cjvf filename.tar.bz2 file

wc:
ls -l | wc -l


tr:
ls -l | tr 'a-z' 'A-Z'


grep:
ls -l | grep ^d
ls -l | grep -n ^d
ls -l | grep -v ^d
echo "theaaaa
the
bbbbthe | grep '\<the\>'


echo "theaaaa
the
bbbbthe | grep -A1 -B1 '\<the\>'


awk:
ls -l | awk '{print $1}'
echo "a|b|c" | awk -F\| '{print $1}'


sed:
ls -l | sed 's/largetalk/root/g'
seq 6 | sed '1!G;h;$!d'

linux命令之declare


declare
typeset #the alias name of declare
declare -p # show all var
declare -p var #show the var
declare var=value # the same with var=value


declare -i var #the var is integer
declare -r var #the var is read only
declare -a var #the var is array
declare -f # show all function include name and body
declare -F # shwo all function name
declare -f func #show the func
declare -x var # set the var into env
declare -x var=value # set env


linux命令之perror
perror errno # show the mean of errno, eg. perror 1 /* Operation not permitted */

其他如df, top, free, uptime等就不说了
shell就是把很多小命令组合成一个大的工作，有时候还是很方便的，虽然很难看懂，奉送一个我写的shell，不算太复杂，但太长太难懂
ssh "$serena_user"@"$serena_host" "find /var/www/ellis/media/upload -name \*.mp3 | xargs file | grep -v Audio | awk -F: '{print \$1, \$2}' | awk -F, '{print \$1, \$4, \$5}' | awk '{if (\$4!=32 || \$6     != 22.05) print \$1, \$4, \$5, \$6, \$7}' | awk '{content=\$1;   print \$0; system(\"stat -c %s \"content)}' " > $unsuitmp3