在制作Linux小系统时，我们需要复制需要用到的命令到指定目录，同时包括一些命令所依赖的库文件,整个复制工作十分繁琐，这里我们使用脚本来简化我们的操作
[root@wxxdc-sys-ilodhcp01 ~]# which ls #二进制命令所在路径
alias ls='ls --color=auto'
/bin/ls
[root@wxxdc-sys-ilodhcp01 ~]# ldd /bin/ls #ldd命令查看命令所依赖的库文件
linux-vdso.so.1 => (0x00007ffe60bda000)
libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f72b37b4000)
libcap.so.2 => /lib64/libcap.so.2 (0x00007f72b35af000)
libacl.so.1 => /lib64/libacl.so.1 (0x00007f72b33a5000)
libc.so.6 => /lib64/libc.so.6 (0x00007f72b2fd8000)
libpcre.so.1 => /lib64/libpcre.so.1 (0x00007f72b2d76000)
libdl.so.2 => /lib64/libdl.so.2 (0x00007f72b2b71000)
/lib64/ld-linux-x86-64.so.2 (0x00007f72b39e8000)
libattr.so.1 => /lib64/libattr.so.1 (0x00007f72b296c000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f72b2750000)
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#!/bin/bash
DEST=/mnt/sysroot
libcp() {
LIBPATH=${1%/*}
[ ! -d $DEST$LIBPATH ] && mkdir -p $DEST$LIBPATH
[ ! -e $DEST${1} ] && cp $1 $DEST$LIBPATH && echo "copy lib $1 finished"
}
bin_cp() {
CMDPATH=${1%/*}
[ ! -d $DEST$CMDPATH ] && mkdir -p $DEST$CMDPATH
[ ! -e $DEST${1} ] && cp $1 $DEST$CMDPATH
for i in `ldd $1 | grep -o "/[^[:space:]]*"`; do
libcp $i
done
}
read -p "please input your commad: " CMD
until [ $CMD = 'q' ];do
! which $CMD && echo "Wrong command" && read -p "please input again" CMD && continue
COMMAND=`which $CMD | grep -v "^alias" | grep -o "/.*"`
bin_cp $COMMAND
echo "copy $COMMAND finished"
read -p "Continue: " CMD
done
man bash #截取目录
${parameter#word}
${parameter##word}
Remove matching prefix pattern. The word is expanded to produce a pattern just as in pathname expansion. If
the pattern matches the beginning of the value of parameter, then the result of the expansion is the expanded
value of parameter with the shortest matching pattern (the ``#'' case) or the longest matching pattern (the
``##'' case) deleted. If parameter is @ or *, the pattern removal operation is applied to each positional
parameter in turn, and the expansion is the resultant list. If parameter is an array variable subscripted with
@ or *, the pattern removal operation is applied to each member of the array in turn, and the expansion is the
resultant list.
${parameter%word}
${parameter%%word}
Remove matching suffix pattern. The word is expanded to produce a pattern just as in pathname expansion. If
the pattern matches a trailing portion of the expanded value of parameter, then the result of the expansion is
the expanded value of parameter with the shortest matching pattern (the ``%'' case) or the longest matching
pattern (the ``%%'' case) deleted. If parameter is @ or *, the pattern removal operation is applied to each
positional parameter in turn, and the expansion is the resultant list. If parameter is an array variable sub‐
scripted with @ or *, the pattern removal operation is applied to each member of the array in turn, and the
expansion is the resultant list.
例子：
FILE=/usr/local/src
echo ${FILE#*/} 一个#号表示从左往右找到第一个/往左的所有字符删除
echo ${FILE##*/} 两个#号表示从左往右找到最后一个/往左的所有字符删除
echo ${FILE%/*} 一个%号表示从右往左找到第一个/往右的所有字符删除
echo ${FILE%%/*} 两个%号表示从右往左找到最后一个/往右的所有字符删除
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