因此，我尝试将一个文件的内容附加到另一个文件（如果尚未包含）。这就是我尝试的方法：
catAndAppendIfMissing(){
[[ ! -s $2 ]] && touch "$2" || [[ ! -s $2 ]] && sudo touch "$2"
if grep $1 $2; then
echo "found"
else
catAndAppend $1 $2 #this appends file $1 contents to file $2 (and takes care of adding newlines if needed and uses sudo if needed, thus the separate function)
fi
}
使用
if grep $1 $2我该如何解决这个问题？
精度：
cat $file1 >> $file2.
alias ls='ls -a'
alias mkdir="mkdir -pv"
alias wget="wget -c"
alias histg="history | grep"
alias echopath='echo $PATH | tr -s ":" "\n"'
alias myip="curl -sSL http://ipecho.net/plain | xargs echo"
alias webpic="mogrify -resize 690\> *.png"
alias cddog='cd ~/dev/go/src/github.com/dogtools/dog'
alias xp='cd ~/dev/go/src/experiments'
如果文件
$1$2 中的 任何地方，则不要追加：
catAndAppendIfMissing(){
f1=$(wc -c < "$1")
diff -y <(od -An -tx1 -w1 -v "$1") <(od -An -tx1 -w1 -v "$2") | \
rev | cut -f2 | uniq -c | grep -v '[>|]' | numgrep /${f1}../ | \
grep -q -m1 '.+*' || cat "$1" >> "$2"; }
工作原理：
$1wcodbashdiffrevcutuniq$f1numgrep注释。好：也适用于二进制文件。不好：效率低下，
oddiffod（旧版本）。 如果文件
$1$2catAndAppendIfMissing(){
f1=$(wc -c < "$1")
f2=$(wc -c < "$2")
[ $f1 -le $f2 ] && cmp -s "$1" "$2" 0 $(( $f2 - $f1 )) && return 1
cat "$1" >> "$2"
}
工作原理：
wc$f1$f2cmp 将其附加到第二个文件cat。否则 return可能不值得尝试有条件地更新文件；只需获取每个文件以确保定义所有别名，然后无条件地将
aliassource "$1" # Original aliases
source "$2" # New aliases
alias > "$1" # Combined aliases
线路：
if grep $1 $2
应该是：
if grep `cat $1` $2
或
file1_Content=`cat $1`
if grep ${file1_Content} $2
或
file1_Content=`cat $1`
grep ${file1_Content} $2
if [ $? == 0 ];then
echo "found"
else
#catAndAppend
fi
所以我做了功课，想出了一个（几乎）符合要求的解决方案，唯一的区别是它是用 python 而不是 bash 完成的。然后从 bash 调用我的 python 脚本。
所以这是代码：
import re, os, subprocess, mmap, sys, pprint
def isFile1InFile2(file1Path, file2Path):
with open(file2Path) as file2:
file2Access = mmap.mmap(file2.fileno(), 0, access=mmap.ACCESS_READ)
file1Contents = open(file1Path).read()
if file2Access.find(file1Contents) != -1:
return True
else:
return False
def appendIfMissing(source, dest):
destFullPath = os.path.expanduser(dest)
if os.path.isfile(destFullPath):
if isFile1InFile2(source, destFullPath):
print ('Source\'s contents found in dest file, no need to append')
else:
print('Source\'s contents cannot be found in dest file, appending...')
# append source file to destfile
command = ' '.join(['source', './common/configs/.shell-functions', '&&', 'catAndAppend', source, destFullPath])
os.system(command)
else:
print "destfile not a file yet, copying sourcefile to destfile..."
# copy source file to destfile
command = ' '.join(['source', './common/configs/.shell-functions', '&&', 'catAndAppend', source, destFullPath])
print command
os.system(command)
if len(sys.argv) != 3:
sys.exit('[ERROR] appendIfMissing.py, line 31: number of arguments passed is not 3')
else:
appendIfMissing(sys.argv[1], sys.argv[2])
然后从 bash 调用它：
appendIfMissing(){
python ./common/configs/appendIfMissing.py $1 $2
}
bash 函数（从 python 调用的函数）保持不变：
createFileIfMissing(){
# create file if doesn't exist, with right permission
[[ ! -s $1 ]] && touch "$1" || [[ ! -s $1 ]] && sudo touch "$1"
}
addNewLineToFile(){
[[ ! -e $1 ]] || [[ -w $1 ]] && printf "\n" >> $1 || [[ -e $1 ]] && [[ ! -w $1 ]] && sudo bash -c "printf \"\n\" >> $1"
}
catAndAppend(){
createFileIfMissing $2
# append stuff to it
[[ ! -e $2 ]] || [[ -w $2 ]] && cat $1 >> $2 || [[ -e $2 ]] && [[ ! -w $2 ]] && sudo bash -c "cat $1 >> $2"
addNewLineTo $2
}
缺点：
优点：